Battery package and protection structure mechanical property test fixture

Abstract

The utility model relates to a battery package and protection structure mechanical property test fixture belongs to battery package and protection technical field. Through design U shape structure mounting seat, install opposite movable clamping plate subassembly on the both sides side plate of mounting seat and realize battery package and protection structure's horizontal X direction limit, and install side plate unit subassembly on the clamping plate and realize battery package and protection structure's horizontal Y direction limit, through the mounting seat installation on test equipment workbench, installs the loading head on the force end of test equipment, realizes the mechanical property test to the package structure of battery loading, to solve the existing compression test fixture only horizontal single direction limit, not suitable for the mechanical property test of honeycomb package structure of horizontal placement transportation, leads to the problem that the package structure performance evaluation is not comprehensive.

Description

Technical Field

[0001] This utility model relates to the field of battery packaging and protection technology, specifically to a battery packaging structural mechanical performance testing fixture. Background Technology

[0002] Battery packaging and protection structures (hereinafter referred to as "packaging structures") are mainly used to solve the problem of fixed battery quantity and low packaging density in existing battery safety transportation packaging technologies. Their structure is as follows: Figure 8 As shown, the packaging structure consists of one or more honeycomb-structured packaging units, each containing a cylindrical battery. The packaging structure is typically placed horizontally during transportation and is subjected to external forces in both the horizontal and vertical directions. For research purposes... Figure 8 The protective effect of different protective structures composed of packaging units on the battery needs to be realistically simulated under the mechanical load of actual operation in a laboratory environment. In order to conduct quantitative mechanical performance tests on different protective structures, the batteries are installed in different packaging structures and corresponding mechanical performance tests (including pressure tests and indentation tests) are carried out to accurately evaluate the protective effect of the protective structures.

[0003] Existing compression test fixtures have a simple structure, typically consisting of side plates and a base plate. They can only limit the movement of the test sample in a single horizontal direction, making it difficult to simulate the complex working conditions of battery packaging structures subjected to external forces in two vertical directions simultaneously during actual transportation. Furthermore, because existing compression test fixtures only limit movement in the horizontal direction, the battery may detach from the packaging structure during the vertical force applied by the indenter, leading to inaccurate test results. Therefore, for Figure 8 The packaging structure shown is placed horizontally for transportation. Using existing compression test fixtures for mechanical performance testing has obvious deficiencies and limitations, which will lead to an incomplete evaluation of the protective performance of the packaging structure.

[0004] Therefore, there is a need to provide a battery packaging and protective structure mechanical performance testing fixture to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved: To overcome the shortcomings of existing technologies, this utility model provides a battery packaging and protective structure mechanical performance testing fixture. By designing a U-shaped mounting base, two sets of opposing movable clamping plate assemblies are installed on the side plates of the mounting base to achieve horizontal X-direction limitation of the packaging structure. Side plate unit assemblies are installed on the clamping plates to achieve horizontal Y-direction limitation of the packaging structure. This solves the problem that existing compression test fixtures only limit the horizontal direction and are not suitable for testing the mechanical performance of honeycomb packaging structures that are placed horizontally for transportation, resulting in incomplete evaluation of the packaging structure performance.

[0006] The technical solution of this utility model is: a battery packaging and protective structure mechanical performance testing fixture, comprising: The mounting base is a U-shaped plate structure, which includes a base plate and two side plates. The two side plates are symmetrically provided with through holes. The packaging structure is placed horizontally on the base plate of the mounting base. Two sets of clamping plate assemblies are symmetrically installed on the mounting base for horizontal X-axis clamping and limiting of the packaging structure; the clamping plate assembly includes a clamping plate, a screw and a locking nut assembly, the screw passes through the through hole of the side plate, the clamping plate is vertically installed at the end of the screw located inside the side plate, and the locking nut assembly is used to lock the axial position of the screw; Two sets of side panel unit assemblies are symmetrically installed on two clamping plates for horizontal Y-axis clamping and limiting of the packaging structure. The side panel unit assembly includes a first side panel unit, a second side panel unit, and a third side panel unit. The first side panel unit is adjustablely and fixedly connected to a clamping plate, and the third side panel unit is adjustablely and fixedly connected to another clamping plate. The second side panel unit is detachably installed between the first side panel unit and the third side panel unit.

[0007] A further technical solution of this utility model is: multiple guide grooves are symmetrically provided at both ends of the clamping plate relative to the screw, and the guide grooves are used to adjust the installation of the first side plate unit or the third side plate unit by bolts; two first side plate units are symmetrically installed on both sides of one clamping plate, and two third side plate units are symmetrically installed on both sides of another clamping plate.

[0008] A further technical solution of this utility model is that the groove direction of the guide groove is perpendicular to the screw.

[0009] A further technical solution of this utility model is: the first side plate unit is an L-shaped plate, with a first mounting hole on one side plate for connecting with the guide groove of the clamping plate, and a first protrusion on the other side plate for docking with the second side plate unit.

[0010] A further technical solution of this utility model is: the third side plate unit is an L-shaped plate, with a second mounting hole on one side plate for connecting with the guide groove of the clamping plate, and a first groove on the other side plate for docking with the second side plate unit.

[0011] A further technical solution of this utility model is: a second groove is provided at one end of the second side plate unit, the second groove is adapted to the first protrusion, and the first protrusion is inserted into the second groove to realize the docking of the first side plate unit and the second side plate unit; a second protrusion is provided at the other end of the second side plate unit, the second protrusion is adapted to the first groove, and the second protrusion is inserted into the first groove to realize the docking of the second side plate unit and the third side plate unit.

[0012] A further technical solution of this utility model is: the locking nut assembly includes two nuts, one is a back nut and the other is a locking nut, both of which are threadedly connected to the screw. The back nut is located inside the side plate of the mounting base, and the locking nut is located outside the side plate. The back nut and the locking nut cooperate to lock the axial position of the screw.

[0013] A further technical solution of this utility model is: the battery packaging structure mechanical performance testing fixture further includes a loading head, which includes a force-applying head and a mounting rod; the mounting rod is used to be rigidly connected coaxially with the force-applying end of the test loading device; the force-applying head is fixed to the lower end face of the mounting rod, and the force-applying head contacts the top of the packaging structure to apply a load to the packaging structure.

[0014] A further technical solution of this utility model is: the force-applying head is a plate-shaped or semi-cylindrical structure. The plate-shaped force-applying head is used for conventional pressure testing of the packaging structure, and the lower end face of the plate-shaped force-applying head contacts the top of the packaging structure; the semi-cylindrical force-applying head is used for indentation testing of the packaging structure, and the cylindrical surface of the semi-cylindrical force-applying head contacts the top of the packaging structure.

[0015] A further technical solution of this utility model is: a mounting column is provided at the center of the lower end face of the base plate of the mounting seat, and the mounting column is used to rigidly connect with the clamp of the test loading device.

[0016] The beneficial effects of this utility model are as follows: The battery packaging and protective structure mechanical performance testing fixture provided by this utility model can simulate the real loading and transportation environment of the battery and packaging structure. During the mechanical performance test, the horizontal X-direction displacement of the packaging structure is effectively limited by two sets of clamping plate assemblies, and the horizontal Y-direction displacement of the packaging structure is effectively limited by two sets of side plate unit assemblies. Then, the vertical pressure of the loading head and the vertical limit of the mounting seat, combined with the horizontal bidirectional limit and the vertical pressure, can realize the mechanical performance test under the simulated loading and transportation environment, which significantly improves the stability and reliability of the test and ensures the accuracy of the mechanical performance test results.

[0017] In this test fixture, the distance between the two clamping plates can be adjusted using the locking nut assembly. The distance between the two sets of side plate unit assemblies can be achieved by adjusting the installation positions of the first and third side plate units in the guide groove. Furthermore, to accommodate different clamping plate spacings, a second side plate unit of appropriate specifications can be selected to connect the first and third side plate units. This structure allows for bidirectional adjustment in both the X and Y directions, making it suitable for testing packaging structures of different sizes and significantly improving testing efficiency and economic benefits.

[0018] In this test fixture, the clamping plate assembly is adjusted and locked by the locking nut assembly, which can realize the horizontal X-axis position adjustment of the packaging structure. The side plate unit assembly can realize the horizontal Y-axis position adjustment of the packaging structure by adjusting the installation position of the guide groove. This ensures that packaging structures of different sizes and specifications are clamped, and also ensures that the packaging structure is stably and reliably installed directly below the loading head, avoiding the skew of the loading force and ensuring the readiness of the test.

[0019] Compared to traditional horizontal unidirectional restraint, this structure achieves horizontal bidirectional restraint of the battery and packaging structure during testing, avoiding the risk of sample slippage in the other direction and test failure that may occur with traditional unidirectional horizontal restraint structures. Simultaneously, the use of two sets of side plate unit components effectively prevents test failure due to relative displacement between the battery and packaging structure during testing.

[0020] This test fixture has a simple structure, is easy to operate, and is highly durable and maintainable, meeting the requirements for evaluating the mechanical performance of cylindrical battery packaging structures. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of a battery packaging and protective structure mechanical performance testing fixture according to the present invention; Figure 2 This is a schematic diagram of the loading head structure in this utility model (its force-applying head is a plate-shaped force-applying head); Figure 3 This is a schematic diagram of the mounting base structure in this utility model; Figure 4 This is a schematic diagram of the connection structure between the clamping plate and the screw in the clamping plate assembly of this utility model; Figure 5 This is a schematic diagram of the first side plate unit structure in this utility model; Figure 6 This is a schematic diagram of the second side plate unit structure in this utility model; Figure 7 This is a schematic diagram of the third side plate unit structure in this utility model; Figure 8 This is a schematic diagram of a packaging structure (containing a packaging unit). Figure 9 This mechanical property testing fixture is for Figure 8A schematic diagram of the packaging structure shown undergoing a pressure test; Figure 10 This mechanical property testing fixture is for Figure 8 The diagram shows a packaging structure subjected to an indentation test.

[0023] In the diagram: 1. Mounting base, 11. Base plate, 12. Side plate, 121. Through hole, 13. Mounting post, 2. Clamping plate assembly, 21. Clamping plate, 211. Guide groove, 22. Screw, 23. Locking nut assembly, 231. Back nut, 232. Locking nut, 3. Side plate unit assembly, 31. First side plate unit, 311. First mounting hole, 312. First protrusion, 32. Second side plate unit, 321. Second groove, 322. Second protrusion, 33. Third side plate unit, 331. Second mounting hole, 332. First groove, 4. Loading head, 41. Force application head, 411. Plate-shaped force application head, 412. Semi-cylindrical force application head, 42. Mounting rod, 5. Packaging structure, 6. Bolt. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] This utility model discloses an embodiment of a battery packaging and protective structure mechanical performance testing fixture. The fixture is mounted on a mechanical testing loading device to achieve [the desired performance]. Figure 8 The battery packaging and protective structure shown were subjected to mechanical performance tests. Figure 1 As shown, the fixture includes a mounting base 1, two sets of clamping plate assemblies 2, two sets of side plate unit assemblies 3, and a loading head 4.

[0026] like Figure 1 , Figure 3 As shown, the main body of the mounting base 1 is a U-shaped plate structure, including a horizontally arranged base plate 11 and two side plates 12 located on both sides of the base plate 11 and perpendicular to the base plate 11. The U-shaped groove formed by the base plate 11 and the two side plates 12 is used to place the packaging structure 5 to be tested. The packaging structure 5 is placed horizontally on the base plate 11 of the mounting base. The two side plates 12 are symmetrically provided with through holes 121 for installing the clamping plate assembly 2. A mounting post 13 is provided at the center of the lower end face of the base plate 11 of the mounting base 1. The mounting post 13 is perpendicular to the base plate 11 and is used to rigidly connect with the clamp of the test loading equipment. The clamp of the test loading equipment is the clamping worktable of the equipment, which can clamp and fix the mounting post 13, thereby fixing the position of the mounting base 1.

[0027] like Figure 1 , Figure 4 As shown, two sets of clamping plate assemblies 2 are symmetrically mounted on the mounting base 1. These clamping plate assemblies 2 are used for horizontal X-axis clamping and limiting of the packaging structure 5. Each clamping plate assembly 2 includes a clamping plate 21, a screw 22, and a locking nut assembly 23. The screw 22 has external threads and passes through a through hole 121 in the side plate 12. The clamping plate 21 and the screw 22 are perpendicular and mounted at the end of the screw 22 located within the side plate 12. The screw 22 and the clamping plate 21 are detachably and fixedly connected at their center positions. The locking nut assembly 23 is threadedly connected to the screw 22 and is used to lock the axial position of the screw 22. See also... Figure 9 The locking nut assembly 23 consists of two nuts: a back nut 231 and a locking nut 232, both threadedly connected to the screw 22. The back nut 231 is located inside the side plate 12 of the mounting base 1, and the locking nut 232 is located outside the side plate 12. The back nut 231 serves to prevent loosening, while the locking nut 232 serves to lock. The back nut 231 and the locking nut 232 cooperate to lock the axial position of the screw 22. By loosening the two nuts, the axial position of the screw 22 can be adjusted, thereby adjusting the distance between the two clamping plates 21 to clamp the packaging structure 5 of the corresponding size and specifications. At the same time, the two clamping plate assemblies 2 are adjusted symmetrically so that the packaging structure 5 is located directly below the force application end of the test loading equipment, avoiding uneven loading during the test.

[0028] like Figure 1 , Figure 5 , Figure 6 and Figure 7 As shown, two sets of side plate unit assemblies 3 are symmetrically installed on two clamping plates 21, and are used together for horizontal Y-axis clamping and limiting of the packaging structure 5. The side plate unit assembly 3 includes a first side plate unit 31, a second side plate unit 32, and a third side plate unit 33. The first side plate unit 31 is movable and fixedly connected to one clamping plate 21, and the third side plate unit 33 is movable and fixedly connected to another clamping plate 21. The second side plate unit 32 is detachably installed between the first side plate unit 31 and the third side plate unit 33. The same set of side plate unit assemblies 3 forms the same limiting surface. The clamping plates 21 have four guide grooves 211 symmetrically arranged at both ends relative to the screw 22, arranged in pairs symmetrically, with the two guide grooves 211 in the same pair arranged parallel to each other. The groove direction of the guide grooves 211 is perpendicular to the screw 22. The guide grooves 211 are used for adjustable mounting of the first side plate unit 31 or the third side plate unit 33 via bolts. Two first side plate units 31 are symmetrically installed on both sides of a clamping plate 21, and two third side plate units 33 are symmetrically installed on both sides of another clamping plate 21.

[0029] Specifically, such as Figure 1 , Figure 5As shown, the first side plate unit 31 is an L-shaped plate. Two first mounting holes 311 are provided on one side plate of the first side plate unit 31, which are used to connect with a set of guide grooves 211 of the clamping plate 21. Two first protrusions 312 are provided on the other side plate, which are used to mate with the second side plate unit 32. During installation, the first side plate unit 31 is fixedly connected to the clamping plate 21 by inserting two bolts through the two first mounting holes 311 and the guide grooves 211 of the clamping plate 21, and then locked by nuts. The first side plate unit 31 can be moved by adjusting its installation position in the guide grooves 211.

[0030] like Figure 1 , Figure 7 As shown, the third side plate unit 33 is also an L-shaped plate. One side plate of the third side plate unit 33 has a second mounting hole 331, which is used to connect with a set of guide grooves 211 of the clamping plate 21. The other side plate has a first groove 332, which is used to mate with the second side plate unit 32. During installation, the third side plate unit 33 is fixedly connected to the clamping plate 21 by inserting two bolts through the two second mounting holes 331 and the guide grooves 211 of the clamping plate 21, and then by locking with nuts. The installation position of the third side plate unit 33 in the guide grooves 211 can be adjusted to allow for displacement of the third side plate unit 33.

[0031] like Figure 1 , Figure 6 As shown, one end of the second side plate unit 32 is provided with a second groove 321, which is adapted to the first protrusion 312. The first protrusion 312 is inserted into the second groove 321 to achieve docking between the first side plate unit 31 and the second side plate unit 32. The other end of the second side plate unit 32 is provided with a second protrusion 322, which is adapted to the first groove 332. The second protrusion 322 is inserted into the first groove 332 to achieve docking between the second side plate unit 32 and the third side plate unit 33. The second side plate unit 32 is designed with multiple width specifications according to the size range of the packaging structure 5 to be tested, ensuring that when the packaging structure 5 with different horizontal X-axis dimensions is tested using this fixture, there is a second side plate unit 32 with an appropriate width to connect the first side plate unit 31 and the third side plate unit 33, thus limiting the horizontal Y-axis of the packaging structure 5.

[0032] The distance between the two side plate unit assemblies 3 is adjustable. This adjustment is achieved by adjusting the installation positions of the first side plate unit 31 and the third side plate unit 33 in the guide groove 211 of the clamping plate 21, thus accommodating packaging structures 5 of different dimensions in the horizontal Y direction. The horizontal Y-direction positions of the two side plate unit assemblies 3 are adjusted symmetrically to ensure that the packaging structure 5 is clamped and limited in the horizontal Y direction while ensuring that the packaging structure 5 is located directly below the force-applying end of the test loading equipment, avoiding off-center loading. It is important to note that when adjusting the side plate unit assemblies 3 in the horizontal Y direction, the first side plate unit 31 and the third side plate unit 3 of the same group are adjusted synchronously to ensure coplanarity.

[0033] like Figure 2 , Figure 9 and Figure 10 As shown, in order to enable the pressure head of the test loading device to effectively apply force to the packaging structure 5 under test, a loading head 4 is designed in this embodiment. The loading head 4 includes a force-applying head 41 and a mounting rod 42. The mounting rod 42 is used to be rigidly connected coaxially to the force-applying end of the test loading device. The force-applying head 41 is fixed to the lower end face of the mounting rod 42. The force-applying head 42 contacts the top of the packaging structure 5 and is used to apply load to the packaging structure 5.

[0034] In this embodiment, the force-applying head 41 is a plate-shaped or semi-cylindrical structure. The plate-shaped force-applying head 411 is used for conventional pressure testing of the packaging structure. During the test, the lower end face of the plate-shaped force-applying head 411 contacts the top of the packaging structure 5. The semi-cylindrical force-applying head 412 is used for indentation testing of the packaging structure 5. During the test, the cylindrical surface of the semi-cylindrical force-applying head 412 contacts the top of the packaging structure. The in-plane indentation test of the cylindrical battery is used to study the axial performance of the battery. Compared with the conventional pressure test, which causes radial compression to the battery inside the packaging structure 5, the indentation test causes localized radial compression deformation and has a smaller peak load, which can further improve the test efficiency. Through conventional pressure testing and indentation testing, it is possible to detect whether the protection of the internal battery of the packaging structure 5 meets the requirements, thereby providing a basis for improvement of the weak points of the packaging structure 5.

[0035] The dimensions of the plate-shaped force-applying head 411 and the semi-cylindrical force-applying head 412 are adapted to the dimensions of the packaging structure 5 to be tested, and can be replaced according to the dimensions of the packaging structure 5 to ensure that the force-applying head can cover the packaging structure 5.

[0036] Specific application examples: To Figure 8 Taking the mechanical performance test of the packaging structure 5 shown as an example ( Figure 8 As a single packaging unit (in other embodiments, multiple units may be assembled to form packaging structures with different structures), each cell of the packaging structure 5 contains a cylindrical battery.

[0037] The mounting rod 42 of the loading head 4 has the following dimensions: diameter 15 mm and height 30 mm, to be compatible with the test loading equipment; the force application head 41 adopts a plate-shaped force application head 411 with the following dimensions: length 80 mm, width 68 mm and thickness 8 mm.

[0038] The dimensions of the mounting base 1 are: 200 mm long, 100 mm wide, and 8 mm thick. Its side plate 12 is 60 mm high. The diameter of the mounting column 13 at the bottom of the base plate 11 is the same as that of the mounting rod 42 of the loading head 4, and it is directly connected to the test loading equipment.

[0039] The dimensions of the clamping plate 21 are: 150 mm long, 54 mm wide, and 8 mm thick. The clamping plate 21 has four 40 mm long guide grooves 211. A screw 22 with a diameter of 10 mm and a length of 80 mm is connected to the center of one side of the clamping plate 21.

[0040] The dimensions of the side plate where the first mounting hole 311 of the first side plate unit 31 is located are: length 54 mm, width 30 mm, and thickness 5 mm. The dimensions of the side plate where the first protrusion 312 is located are: width 10 mm and thickness 20 mm. The dimensions of the first protrusion 312 are: radius of arc 3 mm, length 10 mm, and thickness 6 mm. The cross-sectional shape of the second side plate unit 32 is the same as that of the side plate where the first protrusion 312 is located in the first side plate unit 32. The horizontal X-direction width of the second side plate unit 32 is 27 mm. Its second groove 321 is adapted to the first protrusion 312, and its second protrusion 322 is the same as the first protrusion 312. The dimensions of the third side plate unit 33 are the same as those of the first side plate unit 31, and its first groove 332 is adapted to the second protrusion 322. The connecting bolts of the first / third side plate units and the clamping plate 21 are the same, with an outer diameter of 6 mm, and are adapted to the mounting holes and guide grooves 211 of the first / third side plate units.

[0041] The fixture is preferably made of 304L stainless steel and subjected to surface heat treatment to improve corrosion resistance and mechanical properties.

[0042] During the test, after placing the sample to be tested in the center of the base plate 11, the first and third side plate units are first fixed to the clamping plate 21 with bolts and nuts. Then, the nuts on both sides of the two side plates 12 are rotated to adjust the clamping plate 21 until it just contacts the test sample, ensuring that each set of side plate unit components is tightly spliced. Subsequently, the axial position of the locking screw 22 is locked by locking the nut assembly, and the mounting column 13 is clamped by the chuck of the test loading device. Finally, the loading head 4 is rigidly connected to the upper loading test device, and the mechanical performance test can begin.

[0043] This fixture structure effectively restricts the relative movement of the test samples, ensuring the stability and accuracy of the test and meeting the diverse mechanical performance testing needs of cylindrical battery packaging structures.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery packaging and protective structure mechanical performance testing fixture, characterized in that, include: The mounting base is a U-shaped plate structure, which includes a base plate and two side plates. The two side plates are symmetrically provided with through holes. The packaging structure is placed horizontally on the base plate of the mounting base. Two sets of clamping plate assemblies are symmetrically installed on the mounting base for horizontal X-axis clamping and limiting of the packaging structure; the clamping plate assembly includes a clamping plate, a screw and a locking nut assembly, the screw passes through the through hole of the side plate, the clamping plate is vertically installed at the end of the screw located inside the side plate, and the locking nut assembly is used to lock the axial position of the screw; Two sets of side panel unit assemblies are symmetrically installed on two clamping plates for horizontal Y-axis clamping and limiting of the packaging structure. The side panel unit assembly includes a first side panel unit, a second side panel unit, and a third side panel unit. The first side panel unit is adjustablely and fixedly connected to a clamping plate, and the third side panel unit is adjustablely and fixedly connected to another clamping plate. The second side panel unit is detachably installed between the first side panel unit and the third side panel unit.

2. The battery packaging and protective structure mechanical performance testing fixture according to claim 1, characterized in that, The clamping plates are symmetrically provided with multiple guide grooves at both ends relative to the screw. The guide grooves are used to adjust the installation of the first side plate unit or the third side plate unit by bolts. Two first side plate units are symmetrically installed on both sides of one clamping plate, and two third side plate units are symmetrically installed on both sides of another clamping plate.

3. The battery packaging and protective structure mechanical performance testing fixture according to claim 2, characterized in that, The guide groove is perpendicular to the screw.

4. The battery packaging and protective structure mechanical performance testing fixture according to claim 2, characterized in that, The first side plate unit is an L-shaped plate. One side plate has a first mounting hole for connecting with the guide groove of the clamping plate. The other side plate has a first protrusion for docking with the second side plate unit.

5. The battery packaging and protective structure mechanical performance testing fixture according to claim 4, characterized in that, The third side plate unit is an L-shaped plate. One side plate has a second mounting hole for connecting with the guide groove of the clamping plate. The other side plate has a first groove for docking with the second side plate unit.

6. The battery packaging and protective structure mechanical performance testing fixture according to claim 5, characterized in that, The second side plate unit has a second groove at one end, which is adapted to the first protrusion. The first protrusion is inserted into the second groove to realize the docking of the first side plate unit and the second side plate unit. The second side plate unit has a second protrusion at the other end, which is adapted to the first groove. The second protrusion is inserted into the first groove to realize the docking of the second side plate unit and the third side plate unit.

7. The battery packaging and protective structure mechanical performance testing fixture according to claim 1, characterized in that, The locking nut assembly includes two nuts, one is a back nut and the other is a locking nut, both of which are threaded to the screw. The back nut is located inside the side plate of the mounting base, and the locking nut is located outside the side plate. The back nut and the locking nut cooperate to lock the axial position of the screw.

8. The battery packaging and protective structure mechanical performance testing fixture according to claim 1, characterized in that, The battery packaging and protective structure mechanical performance testing fixture also includes a loading head, which includes a force-applying head and a mounting rod. The mounting rod is used to be rigidly connected coaxially to the force-applying end of the test loading device. The force-applying head is fixed to the lower end face of the mounting rod and contacts the top of the packaging structure to apply load to the packaging structure.

9. The battery packaging and protective structure mechanical performance testing fixture according to claim 8, characterized in that, The force-applying head is a plate-shaped or semi-cylindrical structure. The plate-shaped force-applying head is used for routine pressure testing of packaging structures. The lower end face of the plate-shaped force-applying head contacts the top of the packaging structure. A semi-cylindrical force-applying head is used for indentation testing of packaging structures, with the cylindrical surface of the semi-cylindrical force-applying head contacting the top of the packaging structure.

10. The battery packaging and protective structure mechanical performance testing fixture according to claim 1, characterized in that, A mounting post is provided at the center of the lower end face of the base plate of the mounting seat, and the mounting post is used to rigidly connect with the clamp of the test loading device.

Images