Test fixing device and fatigue test device
By employing a support base and load-bearing mechanism in the fatigue testing device, and utilizing a fixed base and battery simulation components to avoid deformation of the end plate under test, the problem of insufficient testing accuracy is solved, achieving high-precision and low-cost testing results.
Patent Information
- Application Number
- CN202423288324.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In existing fatigue testing devices, the deformation of the outer surface of the end plate under test during fatigue testing affects the testing accuracy, resulting in poor testing accuracy.
The test employs a support base and a load-bearing mechanism. The two ends of the support base are used to support the end plate under test. The load-bearing mechanism includes a fixed base and a battery simulation component. The fixed base and the battery simulation component are connected. The fixed base is used to withstand the force of the tension mechanism, avoiding direct contact between the tension mechanism and the end plate under test. By using the battery simulation component to replace the real battery cell, the test accuracy is ensured.
The testing accuracy of the fatigue testing device has been improved, ensuring the authenticity of the test results. The use of battery simulation components has reduced costs, enabling cost-effective repeatable testing.
Smart Images
Figure CN223784058U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of testing devices, in particular to a testing fixing device and a fatigue testing device. BACKGROUND
[0002] With the development of science and technology, fatigue testing devices are applied in industry, and are used for testing the fatigue of end plates in modules.
[0003] In the prior art, the existing fatigue testing device includes a tension mechanism connected to the outer surface of the end plate to be tested, and the tension mechanism applies a force away from the end plate to be tested. The tension mechanism is in direct contact with the outer surface of the end plate to be tested. However, the deformation of the outer surface of the end plate to be tested during fatigue testing has an impact, resulting in poor testing accuracy of the existing fatigue testing device. SUMMARY
[0004] An object of the present application is to provide a testing fixing device and a fatigue testing device, which aims to solve the technical problem of poor testing accuracy of the existing fatigue testing device due to the deformation of the outer surface of the end plate to be tested during fatigue testing.
[0005] To achieve the above-mentioned object, one scheme of the present application provides a testing fixing device for testing the fatigue performance of an end plate in a module, which comprises:
[0006] a support seat, opposite ends of the support seat being used to support an end plate to be tested connected by a steel belt;
[0007] a bearing mechanism arranged at the opposite ends of the support seat, the bearing mechanism comprising a fixing seat and a battery simulation assembly, the battery simulation assembly being arranged on the support seat and being used to be placed in the steel belt and in contact with the end plate to be tested, the fixing seat and the battery simulation assembly being connected, and the fixing seat being used to bear a force away from the support seat applied by a tension mechanism.
[0008] Optionally, the battery simulation assembly comprises a battery simulation piece and a connecting piece, the battery simulation piece being used to be placed in the steel belt and in contact with the end plate to be tested, and the connecting piece being connected with the battery simulation piece and the fixing seat respectively.
[0009] Optionally, the connecting piece comprises a first screw rod, a first nut and a second nut, the first screw rod penetrating through the battery simulation piece and the fixing seat respectively, the first nut being threadedly connected with the first screw rod and abutting against opposite ends of the battery simulation piece, and the second nut being threadedly connected with the first screw rod and abutting against opposite ends of the fixing seat.
[0010] Optionally, the connecting piece comprises a second screw rod, a third nut and a fourth nut, the second screw rod is respectively arranged in the battery cell simulation piece and the fixing base, the third nut and the fourth nut are respectively screwed with the second screw rod, and the fixing base is clamped.
[0011] Optionally, the battery cell simulation piece comprises an expanded battery cell profiling plate and a first connecting plate, the first connecting plate and the expanded battery cell profiling plate are detachably connected, the expanded battery cell profiling plate is arranged in the steel belt and is in contact with the to-be-tested end plate, and the connecting piece is connected with the first connecting plate.
[0012] Optionally, the battery cell simulation piece comprises a second connecting plate, the second connecting plate is in contact with a side of the first connecting plate away from the expanded battery cell profiling plate, and the connecting piece is connected with the first connecting plate through the second connecting plate.
[0013] Optionally, a side of the expanded battery cell profiling plate away from the first connecting plate is provided with an arc surface, and the arc surface is used for being in contact with the to-be-tested end plate.
[0014] Optionally, the battery simulation assembly further comprises a separator, the separator is arranged on one side of the battery cell simulation piece, and the battery cell simulation piece is used for being in contact with the to-be-tested end plate through the separator.
[0015] Optionally, the support base comprises a support plate, a reinforcing piece and a positioning block, the support plate is used for bearing the to-be-tested end plate, the reinforcing piece is arranged on a side of the support plate away from the battery simulation assembly, and the positioning block is arranged on opposite ends of the support plate and is used for being in contact with a test platform.
[0016] To achieve the above object, a scheme provided by the present application is as follows: a fatigue test device, comprising a tension mechanism and the test fixing device, the test fixing device is placed on a test platform of the tension mechanism and is connected with an output end of the tension mechanism.
[0017] The present application has the following beneficial effects:
[0018] The utility model provides a kind of test fixing device and fatigue test device applied to, the opposite ends of support seat are used to bear the end plate to be measured connected with steel band;Carrying mechanism is arranged at the opposite ends of support seat, and carrying mechanism includes fixed seat and battery simulation component, and battery simulation component is set on support seat, and battery simulation component is used to place in steel band and contact with the end plate to be measured, and fixed seat and battery simulation component are connected, and fixed seat is used to bear the force that pulling mechanism exerts perpendicular to the direction of large surface of the end plate to be measured, and the end plate to be measured is fixed by fixed seat and battery simulation component, to facilitate fixed seat and battery simulation component to support the end plate to be measured, prevent pulling mechanism and the end plate to be measured from direct contact, avoid the deformation of the outer surface of the end plate to be measured in fatigue test to produce influence, improve the test precision of fatigue test device, and battery simulation component is used to replace real battery core, and the test authenticity of test fixing device to the end plate to be measured is guaranteed.
[0019] This set of test fixing device is all machined parts, battery simulation component is used to replace battery core, and the price is cheap, and repeated test can be carried out, and the cost performance is high.This set of tooling can simultaneously verify the reliability of multiple parts, not only can the end plate to be measured be fatigue tested, but also can the steel band be fatigue tested, and whether the long bolt structure strength of fixed end plate meets the working condition requirement is verified, and it is favorable for us to better design end plate, steel band and other parts. ACCURACY
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can also be obtained according to the structures shown in these drawings without creative labor for those skilled in the art.
[0021] Figure 1 It is the assembly structure schematic view of test fixing device provided by the embodiment of the present application.
[0022] Figure 2 It is the cross-sectional structure schematic view of test fixing device provided by the embodiment of the present application.
[0023] Figure 3 It is shown Figure 2 The local enlarged view of A in
[0024] Figure 4 It is another state cross-sectional structure schematic view of test fixing device provided by the embodiment of the present application.
[0025] Figure 5 It is the schematic view of expanded battery core profiling plate of test fixing device provided by the embodiment of the present application.
[0026] BRIEF DESCRIPTION OF DRAWINGS
[0027] 100, test fixing device;
[0028] 10, support seat; 11, support plate; 12, reinforcing member; 13, positioning block;
[0029] 20, bearing mechanism; 21, fixing seat; 211, connecting end; 22, battery simulation assembly; 221, battery simulation piece; 2211, expanded battery simulation plate; 22111, arc surface; 2212, first connecting plate; 2213, second connecting plate; 222, connecting piece; 2221, first screw; 2222, first nut; 2223, second nut; 2224, second screw; 2225, third nut; 2226, fourth nut; 223, partition plate. DETAILED DESCRIPTION
[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0031] Please refer to the drawings Figures 1-5 The present application embodiment provides a test fixing device 100 applied to a fatigue test device, and the test fixing device 100 is used for fixing a to-be-tested end plate.
[0032] Please refer to the drawings Figures 1-5 In the present application embodiment, the test fixing device 100 includes a support seat 10 and a bearing mechanism 20, and opposite ends of the support seat 10 are used for bearing a to-be-tested end plate connected by a steel belt. The bearing mechanism 20 is arranged at the opposite ends of the support seat 10, and the bearing mechanism 20 includes a fixing seat 21 and a battery simulation assembly 22. The battery simulation assembly 22 is arranged on the support seat 10, and the battery simulation assembly 22 is used for being placed in the steel belt and being in contact with the to-be-tested end plate. The fixing seat 21 and the battery simulation assembly 22 are connected, and the fixing seat 21 is used for bearing an action force perpendicular to a direction of a large surface of the to-be-tested end plate, which is applied by a tension mechanism. The to-be-tested end plate is fixed by the fixing seat 21 and the battery simulation assembly 22, so that the fixing seat 21 and the battery simulation assembly 22 support the to-be-tested end plate, prevent the tension mechanism from directly contacting the to-be-tested end plate, avoid the influence of deformation of an outer surface of the to-be-tested end plate in the fatigue test, improve the test precision of the fatigue test device 100, and at the same time, the battery simulation assembly 22 is used to replace a real battery core, so as to ensure the test authenticity of the test fixing device 100 to the to-be-tested end plate.
[0033] Please refer to the drawingsFigures 1-2 In the embodiment of the present application, the support seat 10 is used as a support component of the test fixing device 100, and the support seat 10 is used to carry the mechanism 20. The opposite ends of the support seat 10 are used to carry the end plate to be tested connected by the steel belt, so that the end plate to be tested connected by the steel belt is fixed on the upper side of the support seat 10, thereby facilitating the support seat 10 to carry the end plate to be tested connected by the steel belt and the mechanism 20.
[0034] Please refer to the accompanying drawings Figures 1-4 In the embodiment of the present application, the carrying mechanism 20 is arranged at the opposite ends of the support seat 10, and the carrying mechanism 20 includes a fixing seat 21 and a battery simulation assembly 22, and the battery simulation assembly 22 is arranged on the support seat 10. The fixing seat 21 and the battery simulation assembly 22 are connected. The fixing seat 21 is used to bear the vertical force applied by the tension mechanism in the direction perpendicular to the large surface of the end plate to be tested, and the end plate to be tested is fixed by the fixing seat 21 and the battery simulation assembly 22, so that the fixing seat 21 and the battery simulation assembly 22 support the end plate to be tested, prevent the tension mechanism from directly contacting the end plate to be tested, avoid the influence of the deformation of the outer surface of the end plate to be tested in the fatigue test, improve the test precision of the fatigue test device 100, and at the same time, the battery simulation assembly 22 is used to replace the real battery core, thereby ensuring the test authenticity of the test fixing device 100 on the end plate to be tested. The battery simulation assembly 22 is used to be placed in the steel belt and contact the end plate to be tested, and the installation condition of the module is truly reproduced, so that not only the fatigue test can be performed on the end plate to be tested, but also the fatigue test can be performed on the steel belt.
[0035] The whole set of test fixing device is a machine part, the battery simulation assembly is used to replace the battery core, the price is cheap, and the repeated test can be performed, and the cost performance is high. The tooling can simultaneously verify the reliability of multiple parts, not only the fatigue test can be performed on the end plate to be tested, but also the fatigue test can be performed on the steel belt and the verification of whether the long bolt structure of the fixed end plate meets the working condition requirement, which is beneficial to better design of the end plate, the steel belt and other parts.
[0036] Please refer to the accompanying drawings Figures 1-4 The battery simulation assembly 22 includes a battery core simulation piece 221 and a connecting piece 222, the battery core simulation piece 221 is used to be placed in the steel belt and contact the end plate to be tested, and the connecting piece 222 is connected with the battery core simulation piece 221 and the fixing seat 21 respectively. The end plate to be tested is between the battery core simulation piece 221 and the fixing seat 21, the fixing seat 21 is connected with the battery core simulation piece 221 through the connecting piece 222, thereby ensuring the clamping degree of the battery core simulation piece 221 and the fixing seat 21 relative to the end plate to be tested. The position deviation of the end plate to be tested is avoided, and the test precision of the test fixing device 100 on the end plate to be tested is ensured.
[0037] Please refer to the accompanying drawings Figure 4The connecting piece 222 comprises a first screw rod 2221, a first nut 2222 and a second nut 2223. The first screw rod 2221 is arranged in the horizontal direction, and the first screw rod 2221 penetrates the battery cell simulation piece 221 and the fixed seat 21 respectively. The first nut 2222 is arranged between the fixed seat 21 and the battery cell simulation piece 221, the first nut 2222 is threadedly connected with the first screw rod 2221, and the first nut 2222 abuts against the opposite ends of the battery cell simulation piece 221. Therefore, the first nut 2222 and the first screw rod 2221 cooperate to limit the position of the battery cell simulation piece 221, ensure the position accuracy of the battery cell simulation piece 221, and prevent the position of the battery cell simulation piece 221 from deviating relative to the end plate to be tested. The second nut 2223 is arranged outside the fixed seat 21, the second nut 2223 is threadedly connected with the first screw rod 2221, and the second nut 2223 abuts against the opposite ends of the fixed seat 21. Therefore, the second nut 2223 and the first screw rod 2221 cooperate to limit the position of the fixed seat 21, ensure the position accuracy of the fixed seat 21, and prevent the position of the fixed seat 21 from deviating relative to the battery cell simulation piece 221. At the same time, the position of the battery cell simulation piece 221 relative to the fixed seat 21 is ensured to be in the center position. The fixed seat 21 and the battery cell simulation piece 221 are rigidly connected through the fixing mode, the battery cell simulation piece 221 cannot shake left and right in the fixed seat 21, the force position of the end plate to be tested is ensured to be in the same plane, and the test process is ensured to be consistent with the actual working condition.
[0038] Please refer to the accompanying drawings Figure 4 The connecting piece 222 comprises a first screw rod 2221, a first nut 2222 and a second nut 2223. The first screw rod 2221 is arranged in the horizontal direction, and the first screw rod 2221 penetrates the battery cell simulation piece 221 and the fixed seat 21 respectively. The first nut 2222 is arranged between the fixed seat 21 and the battery cell simulation piece 221, the first nut 2222 is threadedly connected with the first screw rod 2221, and the first nut 2222 abuts against the opposite ends of the battery cell simulation piece 221. Therefore, the first nut 2222 and the first screw rod 2221 cooperate to limit the position of the battery cell simulation piece 221, ensure the position accuracy of the battery cell simulation piece 221, and prevent the position of the battery cell simulation piece 221 from deviating relative to the end plate to be tested. The second nut 2223 is arranged outside the fixed seat 21, the second nut 2223 is threadedly connected with the first screw rod 2221, and the second nut 2223 abuts against the opposite ends of the fixed seat 21. Therefore, the second nut 2223 and the first screw rod 2221 cooperate to limit the position of the fixed seat 21, ensure the position accuracy of the fixed seat 21, and prevent the position of the fixed seat 21 from deviating relative to the battery cell simulation piece 221. At the same time, the position of the battery cell simulation piece 221 relative to the fixed seat 21 is ensured to be in the center position. The fixed seat 21 and the battery cell simulation piece 221 are rigidly connected through the fixing mode, the battery cell simulation piece 221 cannot shake left and right in the fixed seat 21, the force position of the end plate to be tested is ensured to be in the same plane, and the test process is ensured to be consistent with the actual working condition.
[0039] Please refer to the accompanying drawings Figure 4 The second screw rod 2224, the third nut 2225 and the fourth nut 2226 form a second screw rod assembly, and there are two second screw rod assemblies. The two second screw rod assemblies are arranged on the upper side and the lower side of the first screw rod 2221 respectively, so as to ensure the connection effect of the battery cell simulation piece 221 relative to the fixed seat 21.
[0040] Please refer to the accompanying drawings Figures 2-3The battery simulation assembly 22 further comprises an electric core simulation piece 221, the electric core simulation piece 221 comprises an expanded electric core profile plate 2211 and a first connecting plate 2212, the first connecting plate 2212 and the expanded electric core profile plate 2211 are detachably connected, so that the first connecting plate 2212 can be connected or separated from the expanded electric core profile plate 2211, thereby facilitating replacement of different expanded electric core profile plates 2211. The electric core simulation piece 221 is used for simulating the electric core in different states, thereby avoiding being able to only test one kind of electric core state and improving the test universality of the test fixture 100. The expanded electric core profile plate 2211 is used for being placed in the steel belt and being in contact with the to-be-tested end plate, the connecting piece 222 is connected with the first connecting plate 2212, so that the expanded electric core profile plate 2211 is connected with the connecting piece 222 through the first connecting plate 2212. Optionally, the first connecting plate 2212 is detachably connected with the expanded electric core profile plate 2211 through a bolt connection mode.
[0041] Please refer to the accompanying drawings Figures 2-3 The electric core simulation piece 221 comprises a second connecting plate 2213, the second connecting plate 2213 is in contact with a side of the first connecting plate 2212 away from the expanded electric core profile plate 2211, and the connecting piece 222 is connected with the first connecting plate 2212 through the second connecting plate 2213. When the connecting piece 222 is directly connected with the first connecting plate 2212, the connecting piece 222 applies force through point contact with the first connecting plate 2212. When the connecting piece 222 is connected with the first connecting plate 2212 through the second connecting plate 2213, the second connecting plate 2213 applies force to the first connecting plate 2212 through a surface, so that the first connecting plate 2212 is more balanced in stress, thereby improving the stress effect of the to-be-tested end plate. The first connecting plate 2212 and the expanded electric core profile plate 2211 are similar to the electric core in reality.
[0042] Please refer to the accompanying drawings Figure 5 The side of the expanded electric core profile plate 2211 away from the first connecting plate 2212 has an arc surface 22111, and the arc surface 22111 is used for being in contact with the to-be-tested end plate. In reality, the electric core will be deformed after long-term work, and the plane will be adjusted to an arc surface. The arc surface 22111 simulates the arc surface of the electric core when the electric core is expanded, thereby improving the authenticity of the expanded electric core profile plate 2211 and ensuring the accuracy of the test result.
[0043] Please refer to the accompanying drawings Figures 2-3 The battery simulation assembly 22 further comprises a partition plate 223, the partition plate 223 is arranged on one side of the electric core simulation piece 221, and the electric core simulation piece 221 is used for being in contact with the to-be-tested end plate through the partition plate 223. The partition plate 223 simulates the insulating plate in reality, thereby more truly simulating the actual use environment of the electric core, improving the authenticity of the battery simulation assembly 22 and ensuring the accuracy of the test result.
[0044] Please refer to the accompanying drawings Figure 2The support base 10 comprises a support plate 11, a reinforcing piece 12 and a positioning block 13, the support plate 11 is used for carrying the end plate to be tested, so that the end plate to be tested is fixed to the upper side of the support plate 11. The reinforcing piece 12 is arranged on the side of the support plate 11 away from the battery simulation assembly 22, and the reinforcing piece 12 is connected to the lower side of the support plate 11, so that the strength of the support plate 11 is improved, and the support stability of the support plate 11 relative to the end plate to be tested is ensured. The positioning block 13 is arranged at opposite ends of the support plate 11, and the positioning block 13 is used for contacting the test platform, so that the distance between the support plate 11 and the test platform is supplemented, the stability of the support plate 11 relative to the test platform is ensured, the support plate 11 as a whole is kept at the same height, and then the two end plates to be tested are ensured to be at the same height, so that the direction of the force received by the end plate to be tested is always perpendicular to the large surface of the end plate to be tested. Meanwhile, the positioning block 13 is higher than the reinforcing piece 12 and the fixing seat 21, and the space distance of the simulation actual module from the battery pack box is simulated.
[0045] Please refer to the accompanying drawings Figure 1 The fixing seat 21 is provided with a connecting end 211 extending along the height direction of the fixing seat 21, and the connecting end 211 is used for connecting the tension mechanism, so that the tension mechanism is connected to the fixing seat 21 through the connecting end 211, and then the fixing seat 21 can bear the force applied by the tension mechanism in the direction away from the support base 10 more evenly.
[0046] In another embodiment, a fatigue test device comprises a tension mechanism and a test fixing device 100, the test fixing device 100 is placed on the test platform of the tension mechanism and connected to the output end of the tension mechanism. So that the tension mechanism can cyclically load the end plate to be tested fixed to the test fixing device 100, and then the structural strength of the end plate to be tested can be tested after the test time is completed, and the accuracy of the fatigue test of the fatigue test device on the end plate to be tested is improved.
[0047] The beneficial effects of the present application are:
[0048] The utility model provides a kind of test fixing device 100 and fatigue test device applied to, the opposite ends of support seat 10 are used to bear the end plate to be measured connected with steel band;Carrying mechanism 20 is arranged at the opposite ends of support seat 10, and carrying mechanism 20 includes fixed seat 21 and battery simulation component 22, battery simulation component 22 is arranged on support seat 10, battery simulation component 22 is used to be placed in steel band and contact with the end plate to be measured, fixed seat 21 and battery simulation component 22 are connected, fixed seat 21 is used to bear the force of direction away from support seat 10 exerted by tension mechanism, fixed end plate by fixed seat 21 and battery simulation component 22, so as to facilitate fixed seat 21 and battery simulation component 22 support end plate to be measured, prevent tension mechanism and end plate to be measured from direct contact, avoid the deformation of the outer surface of end plate to be measured in fatigue test to produce influence, improve the test precision of fatigue test device 100, and battery simulation component 22 is used to replace real battery core, to ensure that test fixing device 100 tests the authenticity of end plate to be measured.
[0049] This set of test fixing device is all machined parts, replace battery core by battery simulation component, cheap, and can be repeated test, and cost-effective. This set of tooling can simultaneously verify the reliability of multiple parts, not only can fatigue test end plate, but also can fatigue test steel band and verify whether fixed end plate long bolt structure strength meets working condition requirement, which is beneficial to better design end plate, steel band and other parts.
[0050] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture, and if the specific posture changes, the directional indications will also change accordingly.
[0051] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or can have a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or can be indirectly connected to the other element through a middle element.
[0052] In addition, the descriptions involving "first", "second" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.
[0053] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, any equivalent structural transformation made on the basis of the inventive concept of the present application, and the contents of the specification and drawings, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.
Claims
1. A test fixture for testing the fatigue performance of an end plate in a module, characterized by, The test fixture comprises: a support base, opposite ends of the support base being used to bear the end plate to be tested connected by a steel belt; a bearing mechanism arranged at opposite ends of the support base, the bearing mechanism comprising a fixed seat and a battery simulation assembly, the battery simulation assembly being arranged on the support base, the battery simulation assembly being used to be placed in the steel belt and in contact with the end plate to be tested, the fixed seat and the battery simulation assembly being connected, the fixed seat being used to bear the force applied by the tension mechanism in the direction away from the support base.
2. The test fixture of claim 1, wherein, The battery simulation assembly comprises an electric core simulation piece and a connecting piece, the electric core simulation piece being used to be placed in the steel belt and in contact with the end plate to be tested, the connecting piece being connected with the electric core simulation piece and the fixed seat respectively.
3. The test fixture of claim 2, wherein, The connecting piece comprises a first screw rod, a first nut and a second nut, the first screw rod penetrating the electric core simulation piece and the fixed seat respectively, the first nut being threadedly connected with the first screw rod and abutting opposite ends of the electric core simulation piece, the second nut being threadedly connected with the first screw rod and abutting opposite ends of the fixed seat.
4. The test fixture of claim 3, wherein, The connecting piece comprises a second screw rod, a third nut and a fourth nut, the second screw rod penetrating the electric core simulation piece and the fixed seat respectively, the third nut and the fourth nut being threadedly connected with the second screw rod respectively and clamping the fixed seat.
5. The test fixture of claim 2, wherein, The electric core simulation piece comprises an expanded electric core profiling plate and a first connecting plate, the first connecting plate and the expanded electric core profiling plate being detachably connected, the expanded electric core profiling plate being used to be placed in the steel belt and in contact with the end plate to be tested, the connecting piece being connected with the first connecting plate.
6. The test fixture of claim 5, wherein, The electric core simulation piece comprises a second connecting plate, the second connecting plate being in contact with a side of the first connecting plate away from the expanded electric core profiling plate, the connecting piece being connected with the first connecting plate through the second connecting plate.
7. The test fixture of claim 5, wherein, A side of the expanded electric core profiling plate away from the first connecting plate has an arc surface, the arc surface being used to be in contact with the end plate to be tested.
8. The test fixture of any one of claims 2 to 6, wherein, The battery simulation assembly further comprises a separator, the separator being arranged on a side of the electric core simulation piece, the electric core simulation piece being used to be in contact with the end plate to be tested through the separator.
9. The test fixture of any one of claims 1 to 6, wherein, The support base comprises a support plate, a reinforcing piece and a positioning block, the support plate being used to bear the end plate to be tested, the reinforcing piece being arranged on a side of the support plate away from the battery simulation assembly, the positioning block being arranged at opposite ends of the support plate, the positioning block being used to be in contact with a test platform.
10. A fatigue testing device, characterized by The fatigue test device comprises a tension mechanism and the test fixture according to any one of claims 1 to 9, the test fixture being placed on a test platform of the tension mechanism and connected with an output end of the tension mechanism.