Battery case expansion test fixture

Abstract

The present application relates to a battery shell expansion test fixture, including a first clamp body having a first inner circumferential wall and a first inner end wall connected to the first inner circumferential wall, the first clamp body also having a first assembly part; a second clamp body having a second inner circumferential wall and a second inner end wall connected to the second inner circumferential wall, the second clamp body also having a second assembly part, the second clamp body and the first clamp body are assembled to form a clamping cavity; a connecting component connects and fixes the first assembly part to the second assembly part. The first clamp body and the second clamp body are constructed to form a constrained environment and conditions under the actual group use conditions for the battery shell to be tested. On this basis, the battery shell is pressurized for testing, and the deformation of the battery shell under different air pressures is observed to complete the verification test of the welding strength of the shell and the top cover, thereby ensuring the accuracy of the test results and facilitating a scientific evaluation of the welding strength and expansion performance of the battery shell.

Description

Technical Field

[0001] The present application relates to the technical field of battery safety and reliability testing, and in particular to a battery casing expansion test fixture. Background Art

[0002] In recent years, the market demand for battery use has been growing, and higher requirements have been placed on battery safety and reliability. The battery mainly includes a shell and a battery cell installed in the shell, and the shell is composed of a shell and a top cover. In actual use, if the battery fails, gas will be generated inside the battery cell, causing the shell to expand. At this time, in addition to relying on the explosion-proof valve to open smoothly to release pressure and eliminate potential safety hazards, it is also required that the shell and the top cover should have sufficient welding strength, that is, the shell must have a certain expansion performance.

[0003] In the related art, the welding strength test and verification of the shell and the top cover are all carried out under free expansion conditions. However, in actual use, batteries are usually used in groups. Therefore, there will be large deviations between the stress conditions and working conditions of a single battery under unconstrained conditions and when the batteries are used in groups, resulting in low accuracy of the test results and inability to scientifically evaluate the welding strength and expansion performance of the battery shell. Summary of the invention

[0004] Based on this, it is necessary to provide a battery shell expansion test fixture to address the problem of low accuracy of test results in the prior art.

[0005] The present application provides a battery housing expansion test fixture, which includes:

[0006] A first clamp body, wherein the first clamp body has a first inner circumferential wall and a first inner end wall connected to the first inner circumferential wall, and the first clamp body is further provided with a first assembly portion;

[0007] A second clamp body, wherein the second clamp body has a second inner circumferential wall and a second inner end wall connected to the second inner circumferential wall, the second clamp body is further provided with a second assembly portion, and the second clamp body is assembled with the first clamp body to form a clamping cavity; and

[0008] A connecting component is used to connect and fix the first assembly part and the second assembly part.

[0009] When the battery shell expansion test fixture of the present scheme is working, the battery shell to be tested (composed of a shell and a top cover welded together, and the top cover is located at the axial open end of the shell) is installed in the clamping cavity surrounded by the first clamp body and the second clamp body, and then connected and fixed to the first assembly part and the second assembly part through the connecting component, so as to ensure that the first clamp body and the second clamp body clamp the battery shell to be tested firmly. At this time, the first inner circumferential wall of the first clamp body and the second inner circumferential wall of the second clamp body simultaneously abut against the outer circumferential wall of the battery shell, the first inner end wall abuts against the top surface of the top cover, and the second inner end wall abuts against the bottom of the shell, so that the first clamp body and the second clamp body construct a constrained environment and conditions for the battery shell to be tested that simulate the actual group use conditions. On this basis, the test operation can be started by pressurizing the battery shell (for example, filling it with gas), and the verification test of the welding strength of the shell and the top cover can be completed by observing the deformation of the battery shell under different air pressures, thereby ensuring the accuracy of the test results and facilitating a scientific evaluation of the welding strength and expansion performance of the battery shell.

[0010] The technical solution of this application is further described below:

[0011] In one embodiment, the first clamp specifically includes a first annular plate and a first end plate, the first end plate is connected to one axial end of the first annular plate, the other axial end of the first annular plate is open, the first annular plate is provided with the first inner circumferential wall, the first end plate is provided with the first inner end wall, and the first assembly portion is formed on the outer annular wall of the first annular plate and is arranged close to the open end of the first annular plate.

[0012] In one of the embodiments, the first end plate is provided with at least one first through hole extending through the first end plate in its thickness direction.

[0013] In one embodiment, the first annular plate is inwardly recessed along the end surface of the open end thereof to form at least one first notch.

[0014] In one embodiment, the second clamp specifically includes a second annular plate and a second end plate, the second end plate is connected to one axial end of the second annular plate, the other axial end of the second annular plate is open, the second annular plate is provided with a second inner circumferential wall, the second end plate is provided with a second inner end wall, and the second assembly portion is formed on the outer annular wall of the second annular plate and is arranged close to the open end of the second annular plate.

[0015] In one of the embodiments, the second end plate is provided with at least one second through hole extending through the second end plate in its thickness direction.

[0016] In one embodiment, the second annular plate is inwardly recessed along the end surface of the open end thereof to form at least one second notch.

[0017] In one embodiment, the first assembly portion includes a first assembly plate and a second assembly plate, the first assembly plate and the second assembly plate are arranged at intervals on the outer peripheral wall of the first clamp body along the circumferential direction, and the second assembly portion includes a third assembly plate and a fourth assembly plate, the third assembly plate and the fourth assembly plate are arranged at intervals on the outer peripheral wall of the second clamp body along the circumferential direction, and the third assembly plate is axially aligned with the first assembly plate, and the fourth assembly plate is axially aligned with the first assembly plate;

[0018] The connection assembly includes a first connection member and a second connection member, the first connection member connects and fixes the first assembly plate and the third assembly plate, and the second connection member connects and fixes the second assembly plate and the fourth assembly plate.

[0019] In one embodiment, the first connecting member is configured as a first bolt assembly, the first assembly plate and the third assembly plate are both provided with a first through hole, the two first through holes are arranged in a corresponding manner, the first bolt assembly is passed through the two first through holes to connect and fix the first assembly plate and the third assembly plate, and the first bolt assembly can enable the first clamping body and the second clamping body to move closer to or away from each other;

[0020] The second connecting member is configured as a second bolt assembly, and the second assembly plate and the fourth assembly plate are both provided with a second through hole, and the two second through holes are arranged in opposition, and the second bolt assembly is passed through the two second through holes to connect and fix the second assembly plate to the fourth assembly plate, and the second bolt assembly can enable the first clamping body and the second clamping body to move closer to or away from each other.

[0021] In one embodiment, the first clamp body and the second clamp body are both made of PC+ABS composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is an assembly structure diagram of a battery casing expansion test fixture and a battery casing according to an embodiment of the present application.

[0025] Figure 2 for Figure 1 Schematic diagram of the explosion structure.

[0026] Figure 3 This is a schematic diagram of the structure of the battery shell expansion test fixture.

[0027] Figure 4 It is a schematic structural diagram of the first clamping body.

[0028] Figure 5 It is a schematic structural diagram of the second clamp.

[0029] Description of reference numerals:

[0030] 100. Battery case expansion test fixture; 10. First clamping body; 11. First inner circumferential wall; 12. First inner end wall; 13. First assembly part; 131. First assembly plate; 132. Second assembly plate; 14. First annular plate; 141. First recess; 15. First end plate; 151. First through hole; 20. Second clamping body; 21. Second inner circumferential wall; 22. Second inner end wall; 23. Second assembly part; 231. Third assembly plate; 232. Fourth assembly plate; 24. Second annular plate; 241. Second recess; 25. Second end plate; 251. Second through hole; 30. Connecting assembly; 31. First connecting member; 32. Second connecting member; 40. Clamping cavity; 200. Battery case; 210. Case; 220. Top cover. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0037] See also Figures 1 to 3 , a battery shell expansion test fixture 100 is shown in an embodiment of the present application, which includes a first clamp body 10, a second clamp body 20 and a connecting assembly 30. It can be seen that the first clamp body 10 and the second clamp body 20 adopt a split structure design, and are conveniently assembled or disassembled through the connecting assembly 30, thereby facilitating the clamping of the battery shell 200 to be tested during the test and disassembly after the test.

[0038] In the present application, the battery housing 200 to be tested is specifically a cylindrical housing, that is, the battery product to be tested is a cylindrical battery; accordingly, the test fixture (the abbreviation of the battery housing expansion test fixture 100, the same below) is also a cylindrical structure. Of course, in other embodiments, the battery housing 200 and the battery product may also be of other types.

[0039] Please continue reading Figures 2 to 4 The first clamp body 10 has a first inner circumferential wall 11 and a first inner end wall 12 connected to the first inner circumferential wall 11, and the first clamp body 10 is also provided with a first assembly portion 13; the second clamp body 20 has a second inner circumferential wall 21 and a second inner end wall 22 connected to the second inner circumferential wall 21, and the second clamp body 20 is also provided with a second assembly portion 23. The second clamp body 20 is assembled with the first clamp body 10 to form a clamping cavity 40, and the clamping cavity 40 is used to be loaded into the cylindrical shell; the connecting component 30 connects and fixes the first assembly portion 13 and the second assembly portion 23.

[0040] In summary, the implementation of the technical solution of this embodiment will have the following beneficial effects: when the battery shell expansion test fixture 100 of this solution is used, the battery shell 200 to be tested (composed of a shell 210 and a top cover 220 welded together, and the top cover 220 is located at the axial open end of the shell 210) is installed in the clamping cavity 40 surrounded by the first clamp body 10 and the second clamp body 20, and then connected and fixed with the first assembly part 13 and the second assembly part 23 through the connecting component 30, so as to ensure that the first clamp body 10 and the second clamp body 20 clamp the battery shell 200 to be tested firmly, and at this time, the first inner circumferential wall 11 of the first clamp body 10 and the second inner circumferential wall 21 of the second clamp body 20 simultaneously press against the first inner circumferential wall 12 of the first clamp body 10 and the second inner circumferential wall 21 of the second clamp body 20 The first inner end wall 12 abuts against the outer wall of the battery casing 200, the first inner end wall 12 abuts against the top surface of the top cover 220, and the second inner end wall 22 abuts against the bottom of the shell 210, so that the first clamp body 10 and the second clamp body 20 form a constraint environment and conditions that simulate the actual group use conditions for the battery casing 200 to be tested. On this basis, the test operation can be started by pressurizing the battery casing 210 (for example, filling it with gas), and the verification test of the welding strength of the shell 210 and the top cover 220 can be completed by observing the deformation of the battery casing 200 under different air pressures, thereby ensuring the accuracy of the test results and facilitating a scientific evaluation of the welding strength and expansion performance of the battery casing 200.

[0041] It is necessary to explain that, during the actual clamping test, the first inner end wall 12 may be used to abut against the bottom of the shell 210, and the second inner end wall 22 may be used to abut against the top surface of the top cover 220; the selection may be made according to actual needs.

[0042] In actual use, cylindrical batteries are usually arranged in multiple array structures and used in groups, such as battery cells or battery modules. In order to ensure the stability of the arrangement structure of multiple cylindrical batteries, a support and protection frame made of PC+ABS composite material is required to install and position multiple cylindrical batteries. Based on this, the first clamp body 10 and the second clamp body 20 are both made of PC+ABS composite material in this application. The material of the test fixture and the support and protection frame is the same, so that the strength and other properties of the test fixture can be consistent with the support and protection frame, which helps to ensure that the stress conditions of the simulated cylindrical batteries when clamped in the test fixture are closer to the actual situation, and ensure the accuracy of the test results.

[0043] Of course, in other embodiments, the first clamp body 10 and the second clamp body 20 may also be made of other materials, which can be selected according to actual needs.

[0044] Please continue reading Figures 2 to 5In one embodiment, the first clamp body 10 includes a first annular plate 14 and a first end plate 15, and the first end plate 15 is connected to one axial end of the first annular plate 14. Preferably, the first end plate 15 and the first annular plate 14 are an integrated structure to obtain a higher connection strength, reduce the number of test fixture parts, and improve the performance of the test fixture. The other axial end of the first annular plate 14 is open, the first annular plate 14 is provided with a first inner circumferential wall 11, the first end plate 15 is provided with a first inner end wall 12, and the first assembly portion 13 is formed on the outer ring wall of the first annular plate 14 and is arranged close to the open end of the first annular plate 14.

[0045] Further, the second clamp body 20 includes a second annular plate 24 and a second end plate 25, and the second end plate 25 is connected to one axial end of the second annular plate 24. Preferably, the second end plate 25 and the second annular plate 24 are an integral structure, the other axial end of the second annular plate 24 is open, the second annular plate 24 is provided with a second inner circumferential wall 21, the second end plate 25 is provided with a second inner end wall 22, and the second assembly portion 23 is formed on the outer annular wall of the second annular plate 24 and is arranged close to the open end of the second annular plate 24.

[0046] When clamping the battery case 200 to be tested, one end of the battery case 200 can be first inserted into the cavity surrounded by the first annular plate 14 and the first end plate 15 from the open end of the first annular plate 14, and then the other end of the battery case 200 is inserted into the cavity surrounded by the second annular plate 24 and the second end plate 25 from the open end of the second annular plate 24 (of course, when the battery case 200 to be tested is in a suspended state by means of the positioning mechanism, it is also possible to insert the axial ends of the battery case 200 into the first clamp body at the same time). 10 and the second clamp body 20), at this time, the first clamp body 10 and the second clamp body 20 just enclose and cover the outside of the battery housing 200 to be tested, and the open end of the first clamp body 10 and the open end of the second clamp body 20 just dock and communicate, the first assembly part 13 and the second assembly part 23 are also just aligned and close, and then the first assembly part 13 and the second assembly part 23 are connected and fixed by the connecting component 30, and the first clamp body 10 and the second clamp body 20 can be completed. The battery housing 200 to be tested is clamped and fixed. The installation and operation are simple and convenient, which helps to reduce the difficulty of test operation and improve the efficiency of test operation.

[0047] Based on the above embodiment, the first end plate 15 is provided with at least one first through hole 151 extending through the thickness direction thereof. The second end plate 25 is provided with at least one second through hole 251 extending through the thickness direction thereof.

[0048] Please continue reading Figure 2 and Figure 4The purpose of setting the first through hole 151 and the second through hole 251 is, on the one hand, to make the battery shell 210 after clamping close to the actual group installation condition, and at the same time, to provide expansion space for the expansion and deformation of the top cover 220 and the bottom of the shell 210 respectively; on the other hand, the top cover 220 and / or the bottom of the shell 210 are generally provided with an inflation port, and the inflation port can be exposed through the first through hole 151 and / or the second through hole 251, so as to facilitate the connection of the inflation port with the inflation device during testing to realize pressurization inside the battery shell 210; furthermore, it helps to reduce the manufacturing consumables of the first end plate 15 and the second end plate 25, thereby achieving weight reduction of the test fixture and reducing the manufacturing cost.

[0049] For example, in the present application, two first through holes 151 are provided, having a fan-shaped structure, and the two first through holes 151 are relatively spaced apart. Four second through holes 251 are provided, having a fan-shaped structure, and the four second through holes 251 are evenly spaced apart along the circumferential direction.

[0050] Please continue reading Figure 2 and Figure 5 Furthermore, in another embodiment, the first annular plate 14 is provided with at least one first recess 141 along the end surface of the open end thereof. The second annular plate 24 is provided with at least one second recess 241 along the end surface of the open end thereof. Specifically, the first recess 141 and the second recess 241 are both U-shaped, and are provided in two. The first recess 141 and the second recess 241 are provided in one-to-one correspondence, and the opening of the first recess 141 is aligned and communicated with the opening of the second recess 241, so that the outer peripheral wall of the assembled test fixture is formed with two rectangular windows, and the circumferential wall of the housing 210 is exposed from the two windows. The purpose of such a design is that, on the one hand, the two windows formed can avoid blocking the outer peripheral wall of the shell 210, so that the battery shell 200 after clamping is close to the actual clamping working condition of the group, which helps to improve the accuracy of the test results, and the windows can also provide the required expansion space for the expansion and deformation of the shell 210; on the other hand, it also helps to reduce the manufacturing consumables of the first clamp body 10 and the second clamp body 20, thereby achieving weight reduction of the test fixture and reducing manufacturing costs.

[0051] It is necessary to explain that the length direction of the window is consistent with the axial direction of the test fixture, and the length of the window is less than the axial length of the test fixture. To ensure the structural strength of the test fixture, the two side surfaces of the window in the length direction are connected to the end surface of the first clamp body 10 and the end surface of the second clamp body 20 respectively with a connecting plate of a certain width.

[0052] Please continue reading Figure 1 and Figure 2In addition, based on any of the above embodiments, the first assembly portion 13 includes a first assembly plate 131 and a second assembly plate 132, and the first assembly plate 131 and the second assembly plate 132 are arranged on the outer peripheral wall of the first clamp body 10 at intervals in the circumferential direction, and the second assembly portion 23 includes a third assembly plate 231 and a fourth assembly plate 232, and the third assembly plate 231 and the fourth assembly plate 232 are arranged on the outer peripheral wall of the second clamp body 20 at intervals in the circumferential direction, and the third assembly plate 231 is axially aligned with the first assembly plate 131, and the fourth assembly plate 232 is axially aligned with the first assembly plate 131.

[0053] The connecting assembly 30 includes a first connecting member 31 and a second connecting member 32. The first connecting member 31 connects and fixes the first assembly plate 131 and the third assembly plate 231, and the second connecting member 32 connects and fixes the second assembly plate 132 and the fourth assembly plate 232. In this way, the first clamp body 10 and the second clamp body 20 can be ensured to have high assembly strength and stable and reliable connection, which can effectively prevent the first clamp body 10 and the second clamp body 20 from being displaced and loosened due to the internal squeezing of the battery shell 200 when the battery shell 200 is pressurized and expanded and deformed, thereby affecting the test effect of the battery shell 200.

[0054] It is necessary to explain that there are many ways to realize that the first connecting member 31 connects and fixes the first assembly plate 131 and the third assembly plate 231, and the second connecting member 32 connects and fixes the second assembly plate 132 and the fourth assembly plate 232. For example, in one embodiment, the first connecting member 31 is set as a first bolt assembly, the first assembly plate 131 and the third assembly plate 231 are both provided with a first through hole 151, the two first through holes 151 are arranged in a counterposition, the first bolt assembly is penetrated through the two first through holes 151 to connect and fix the first assembly plate 131 and the third assembly plate 231, and the second connecting member 32 is set as a second bolt assembly, the second assembly plate 132 and the fourth assembly plate 232 are both provided with a second through hole 251, the two second through holes 251 are arranged in a counterposition, and the second bolt assembly is penetrated through the two second through holes 251 to connect and fix the second assembly plate 132 and the fourth assembly plate 232. The bolt connection method has a simple structure, convenient and labor-saving assembly and disassembly operation, and high connection reliability.

[0055] Furthermore, by rationally designing the first bolt assembly and the second bolt assembly, for example, by adding gaskets of different thicknesses or different numbers to the outside of the screw, and installing the gaskets between the first assembly plate 131 and the third assembly plate 231 and the second assembly plate 132 and the fourth assembly plate 232, the first bolt assembly can move the first clamp body 10 and the second clamp body 20 closer to or farther from each other; the second bolt assembly can move the first clamp body 10 and the second clamp body 20 closer to or farther from each other. The first clamp body 10 and the second clamp body 20 are closer to or farther from each other in the axial direction, which is equivalent to flexibly adjusting the length of the clamping cavity 40, thereby enabling the clamping cavity 40 to have the ability to install cylindrical battery housings 200 with different heights, thereby improving the scope of application of the test fixture.

[0056] The first assembly plate 131, the second assembly plate 132, the third assembly plate 231 and the fourth assembly plate 232 are set to be triangular, which has a smaller extension area compared to a rectangular shape, which helps to reduce the overall volume of the test fixture and reduce space occupation. Further, the first assembly plate 131, the second assembly plate 132, the third assembly plate 231 and the fourth assembly plate 232 are all tilted toward the same end of the axial direction of the test fixture. In this way, when the first clamp body 10 and the second clamp body 20 are assembled, the first assembly plate 131 and the third assembly plate 231, and the second assembly plate 132 and the fourth assembly plate 232, which are matched with each other, fit each other to form an initial positioning structure, which can effectively limit the radial displacement and deflection of the first clamp body 10 and the second clamp body 20, affecting the subsequent installation of the first bolt assembly and the second bolt assembly.

[0057] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery shell expansion test fixture, characterized in that: include: A first clamp body, wherein the first clamp body has a first inner circumferential wall and a first inner end wall connected to the first inner circumferential wall, and the first clamp body is further provided with a first assembly portion; A second clamp body, wherein the second clamp body has a second inner circumferential wall and a second inner end wall connected to the second inner circumferential wall, the second clamp body is further provided with a second assembly portion, and the second clamp body is assembled with the first clamp body to form a clamping cavity; as well as, A connecting component is used to connect and fix the first assembly part and the second assembly part.

2. The battery case expansion test fixture according to claim 1, characterized in that: The first clamp specifically includes a first annular plate and a first end plate, the first end plate is connected to one axial end of the first annular plate, the other axial end of the first annular plate is open, the first annular plate is provided with the first inner circumferential wall, the first end plate is provided with the first inner end wall, and the first assembly portion is formed on the outer annular wall of the first annular plate and is arranged close to the open end of the first annular plate.

3. The battery casing expansion test fixture according to claim 2, characterized in that: The first end plate is provided with at least one first through hole extending through the first end plate in its thickness direction.

4. The battery casing expansion test fixture according to claim 2, characterized in that: The first annular plate is inwardly recessed along the end surface of the open end to form at least one first notch.

5. The battery casing expansion test fixture according to claim 1, characterized in that: The second clamp specifically includes a second annular plate and a second end plate, the second end plate is connected to one axial end of the second annular plate, the other axial end of the second annular plate is open, the second annular plate is provided with a second inner circumferential wall, the second end plate is provided with a second inner end wall, and the second assembly portion is formed on the outer annular wall of the second annular plate and is arranged close to the open end of the second annular plate.

6. The battery casing expansion test fixture according to claim 5, characterized in that: The second end plate is provided with at least one second through hole extending through the second end plate in its thickness direction.

7. The battery casing expansion test fixture according to claim 5, characterized in that: The second annular plate is inwardly recessed along the end surface of the open end thereof to form at least one second notch.

8. The battery casing expansion test fixture according to claim 1, characterized in that: The first assembly portion includes a first assembly plate and a second assembly plate, the first assembly plate and the second assembly plate are arranged at intervals on the outer peripheral wall of the first clamp body along the circumferential direction, the second assembly portion includes a third assembly plate and a fourth assembly plate, the third assembly plate and the fourth assembly plate are arranged at intervals on the outer peripheral wall of the second clamp body along the circumferential direction, and the third assembly plate is axially aligned with the first assembly plate, and the fourth assembly plate is axially aligned with the first assembly plate; The connection assembly includes a first connection member and a second connection member, the first connection member connects and fixes the first assembly plate and the third assembly plate, and the second connection member connects and fixes the second assembly plate and the fourth assembly plate.

9. The battery casing expansion test fixture according to claim 8, characterized in that: The first connecting member is configured as a first bolt assembly, the first assembly plate and the third assembly plate are both provided with a first through hole, the two first through holes are arranged in a corresponding manner, the first bolt assembly is passed through the two first through holes to connect and fix the first assembly plate and the third assembly plate, and the first bolt assembly can enable the first clamping body and the second clamping body to move closer to or away from each other; The second connecting member is configured as a second bolt assembly, and the second assembly plate and the fourth assembly plate are both provided with a second through hole, and the two second through holes are arranged in opposition, and the second bolt assembly is passed through the two second through holes to connect and fix the second assembly plate to the fourth assembly plate, and the second bolt assembly can enable the first clamping body and the second clamping body to move closer to or away from each other.

10. The battery casing expansion test fixture according to any one of claims 1 to 9, characterized in that: The first clamp body and the second clamp body are both made of PC+ABS composite material.

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