Test tool and test equipment

Abstract

The utility model provides a testing tool and testing equipment. The testing tool and the testing equipment are used for testing the welding strength of an energy storage device shell when an energy storage device expands and retracts back and forth. The testing tool comprises a first clamp and a second clamp, the first clamp and the second clamp are oppositely arranged in the height direction of the testing tool, the first clamp comprises a supporting plate and a pressing plate, the pressing plate is located on the side, facing the second clamp, of the supporting plate in the height direction of the testing tool, and the pressing plate is arranged around the second clamp. The pressing plate and the supporting plate are used for clamping a fixing plate of an energy storage device shell, the second clamp can move in the height direction of the testing tool relative to the first clamp, the second clamp comprises a first clamping plate and a second clamping plate, and the first clamping plate and the second clamping plate are oppositely arranged in the height direction of the testing tool. The first clamping plate and the second clamping plate are used for clamping a movable plate of the energy storage device shell and can drive the movable plate to move in the height direction of the testing tool relative to the fixed plate.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a test tool and test equipment. Background Art

[0002] A secondary battery (Rechargeable battery), also known as a rechargeable battery or storage battery, refers to a battery that can be recharged to activate the active material and continue to be used after the battery is discharged. The recyclable nature of secondary batteries has made them gradually become the main power source for electrical equipment. As the demand for secondary batteries gradually increases, people's performance requirements in various aspects are also getting higher and higher. During the charging and discharging process of secondary batteries, the battery's core will repeatedly expand and shrink, affecting the welding strength between the various structures in the battery's outer shell, as well as the welding strength between the outer shell and the top cover, reducing the battery's reliability. Therefore, in the process of battery research and development, how to test the impact of the reciprocating changes in the expansion and shrinkage of the core on the welding strength of the battery's outer shell is very important for improving the reliability of the battery during actual use. Utility Model Content

[0003] The present application provides a test fixture and test equipment that can test the welding strength of the energy storage device shell when the energy storage device undergoes reciprocating expansion and contraction, thereby helping to improve the reliability of the energy storage device during actual use and extend the service life of the energy storage device.

[0004] In the first aspect, the present application provides a test fixture for detecting the welding strength of the energy storage device shell, the energy storage device shell includes a fixed plate and a movable plate, the fixed plate is welded to the movable plate and is arranged around the fixed plate, the movable plate is provided with a first assembly hole, the first assembly hole passes through the movable plate along the thickness direction of the movable plate, the test fixture includes a first fixture and a second fixture, along the height direction of the test fixture, the first fixture and the second fixture are arranged relative to each other, the first fixture includes a support plate and a pressure plate, along the height direction of the test fixture, the pressure plate is located on the side of the support plate facing the second fixture, the pressure plate is arranged around the second fixture, the pressure plate and the support plate are used to clamp the fixed plate, and the second fixture can move relative to the first fixture along the height direction of the test fixture. , the second clamp includes a first clamp, a second clamp and a fastener, and the first clamp and the second clamp are arranged opposite to each other along the height direction of the test fixture, the first clamp and the second clamp are used to clamp the movable plate, and can drive the movable plate to move relative to the fixed plate along the height direction of the test fixture, wherein the first clamp is provided with a second assembly hole, the opening of the second assembly hole is located on the surface of the first clamp facing the second clamp, and the second assembly hole is connected to the first assembly hole, the second clamp is provided with a third assembly hole, the third assembly hole passes through the second clamp along the thickness direction of the second clamp and is connected to the first assembly hole, the fastener is passed through the third assembly hole, the first assembly hole and the second assembly hole, and is fixedly connected to the first clamp and the second clamp.

[0005] Particularly, the first clamping plate is provided with a first guide hole, the opening of which is located on the surface of the first clamping plate facing the support plate; the testing fixture further comprises a guide pin, which is fixedly connected to the side of the support plate facing the second fixture and extends into the first guide hole, wherein the length direction of the guide pin is parallel to the movement direction of the second fixture.

[0006] In which, the first guide hole passes through the first splint along the thickness direction of the first splint; the movable plate is provided with a second guide hole, the second guide hole passes through the movable plate along the thickness direction of the movable plate, and is connected with the first guide hole; the second splint is also provided with a third guide hole, the opening of the third guide hole is located on the surface of the second splint facing the first splint, and the third guide hole is connected with the second guide hole; the guide pin is passed through the first guide hole and the second guide hole, and extends into the third guide hole.

[0007] There are multiple first guide holes, and the multiple first guide holes are spaced apart from each other; there are multiple second guide holes, and the multiple second guide holes are spaced apart from each other, and each second guide hole is connected to one first guide hole; there are multiple third guide holes, and the multiple third guide holes are spaced apart from each other, and each third guide hole is connected to one second guide hole; there are multiple guide pins, and the multiple guide pins are spaced apart from each other, and each guide pin is passed through one first guide hole and one second guide hole, and extends into one third guide hole.

[0008] In which, the fixing plate is provided with a first fixing hole, which passes through the fixing plate along the thickness direction of the fixing plate; the supporting plate is provided with a second fixing hole, the opening of the second fixing hole is located on the surface of the supporting plate facing the pressing plate, and the second fixing hole is connected to the first fixing hole; the pressing plate is provided with a third fixing hole, which passes through the pressing plate along the thickness direction of the pressing plate and is connected to the first fixing hole; the first clamp also includes a fixing part, which is passed through the third fixing hole, the first fixing hole and the second fixing hole, and is fixedly connected to the supporting plate and the pressing plate.

[0009] The pressing plate includes a plurality of sub-pressing plates, and the plurality of sub-pressing plates are arranged at intervals around the circumference of the second clamp.

[0010] In which, the fixed plate includes a first part and multiple second parts, the first part is welded to the movable plate and arranged around the movable plate, and the multiple second parts are fixedly connected to the side of the first part away from the movable plate and are arranged at intervals around the first part; each of the sub-pressure plate and the support plate is used to clamp a second part.

[0011] The first clamp further includes a first clamping block, which is fixedly connected to a side of the support plate facing away from the pressing plate, and the first clamping block is used to connect to a tensile testing machine.

[0012] The second clamp further includes a second clamping block, which is fixedly connected to a side of the second clamping plate facing away from the first clamping plate, and the second clamping block is used to connect to the tensile testing machine.

[0013] In a second aspect, the present application also provides a testing device, including a tensile testing machine and the testing tooling as described above, wherein the tensile testing machine is used to connect the first fixture and the second fixture, and drive the second fixture to move relative to the first fixture along the height direction of the testing device.

[0014] In this embodiment, the fixed plate of the energy storage device housing is clamped by the support plate and the pressure plate of the first clamp, and the movable plate of the energy storage device housing is clamped by the first clamp and the second clamp. When the second clamp reciprocates relative to the first clamp, the movable plate can reciprocate relative to the fixed plate driven by the second clamp. During this process, the connection between the movable plate and the fixed plate will crack due to repeated pulling. Under this setting, it is possible to simulate the effect of the reciprocating changes of expansion and contraction of the winding core of the energy storage device during the charging and discharging process on the welding strength of the energy storage device housing, thereby helping R&D personnel to improve the performance of the energy storage device, improve the reliability of the energy storage device during actual use, and extend the service life of the energy storage device. At the same time, compared with directly testing the welding strength of the processed energy storage device, the present application uses a test fixture to simulate the energy storage device housing, which also helps to save R&D costs and achieve cost reduction and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0016] Figure 1 1 is a schematic structural diagram of a testing device and an energy storage device housing provided in an embodiment of the present application;

[0017] Figure 2 yes Figure 1 A schematic diagram of the structure of the test fixture and energy storage device housing in the test equipment shown;

[0018] Figure 3 yes Figure 2 Schematic diagram of the structure of the test fixture and energy storage device housing after being cut open along AA;

[0019] Figure 4 yes Figure 2 A schematic diagram of the structure of the first fixture of the test fixture;

[0020] Figure 5 yes Figure 4 A schematic diagram of the exploded structure of the first clamp shown;

[0021] Figure 6 yes Figure 5 A schematic structural diagram of the support plate and guide pins in the first fixture shown;

[0022] Figure 7 yes Figure 4 A schematic structural diagram of the pressure plate in the first fixture is shown;

[0023] Figure 8 yes Figure 2 Schematic diagram of the structure of the second fixture of the test fixture;

[0024] Figure 9 yes Figure 8 A schematic diagram of the exploded structure of the second clamp shown;

[0025] Figure 10 yes Figure 9 A schematic structural diagram of the first and second clamps in the second clamp shown;

[0026] Figure 11 yes Figure 2 A schematic diagram of the structure of the energy storage device housing;

[0027] Figure 12 yes Figure 11 The schematic diagram of the structure of the energy storage device shell after being cut open along BB is shown.

[0028] The names corresponding to the reference numerals in the figures are:

[0029] Test equipment 100, energy storage device housing 200, tensile testing machine 110, test fixture 120, support frame 111, first clamping jaw 112, second clamping jaw 113, first fixture 10, second fixture 20, support plate 11, first clamping block 12, first connecting member 13, guide pin 14, pressure plate 15, fixing member 16, first mounting hole 101, second fixing hole 102, second mounting hole 121, third fixing hole 152, sub-pressure plate 151, first A clamping plate 21, a second clamping plate 22, a fastener 23, a second clamping block 24, a second connecting member 25, a first guide hole 211, a second assembly hole 212, a third mounting hole 221, a third guide hole 222, a third assembly hole 223, a fourth mounting hole 241, a fixed plate 210, a movable plate 220, a main body 30, a connecting portion 40, a first assembly hole 31, a second guide hole 32, a first fixing hole 201, a first part 50, and a second part 60. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0031] Please refer to Figure 1 and Figure 2 , Figure 1 1 is a schematic structural diagram of a test device 100 and an energy storage device housing 200 provided in an embodiment of the present application. Figure 2 yes Figure 1 The schematic diagram of the structure of the test fixture 120 and the energy storage device housing 200 in the test equipment 100 is shown. Figure 3 yes Figure 2The following is a schematic diagram of the structure of the test fixture 120 and energy storage device housing 200 after being cut along line AA. "Cut along line AA" refers to cutting along the plane along line AA, and similar descriptions below should be interpreted in the same way. Furthermore, for ease of description, the length of the test fixture 120 is defined as the X-axis, the width of the test fixture 120 is defined as the Y-axis, and the height of the test fixture 120 is defined as the Z-axis. The X-axis, Y-axis, and Z-axis directions are mutually perpendicular.

[0032] The present application provides a testing device 100 comprising a tensile testing machine 110 and a testing fixture 120. The tensile testing machine 110 comprises a support frame 111, a first clamping jaw 112, and a second clamping jaw 113. The first clamping jaw 112 and the second clamping jaw 113 are both mounted on the support frame 111. The first clamping jaw 112 and the second clamping jaw 113 are spaced apart and arranged opposite each other along the height direction of the testing device 100. The second clamping jaw 113 is movable relative to the first clamping jaw 112 along the height direction of the testing device 100.

[0033] The test jig 120 is located between the first clamp 112 and the second clamp 113. In this embodiment, the test jig 120 includes a first fixture 10 and a second fixture 20. Along the height direction of the test jig 120, the first fixture 10 and the second fixture 20 are arranged relative to each other. The second fixture 20 can move relative to the first fixture 10 along the height direction of the test jig 120. That is, the movement direction of the second fixture 20 is parallel to the height direction of the test jig 120. The test jig 120 is used to test the weld strength of the energy storage device housing 200. Specifically, the first fixture 10 is connected to the first clamp 112, and the second clamp 20 is connected to the second clamp 113. When the second clamp 113 moves relative to the first clamp 112 along the height direction of the test device 100, the second clamp 20 can move along the height direction of the test device 100 under the drive of the second clamp 113, so that the second clamp 20 can move relative to the first clamp 10 along the height direction of the test jig 120.

[0034] It should be understood that when the energy storage device is charging, alkali metal ions such as lithium ions and sodium ions in the positive electrode sheets of the core of the energy storage device will escape and then be embedded in the negative electrode sheets of the core of the energy storage device or deposited on the surface of the negative electrode sheets, causing the negative electrode sheets of the core of the energy storage device to expand, thereby significantly increasing the thickness of the energy storage device. In other words, the core of the energy storage device expands during the charging process. When the energy storage device is discharging, the alkali metal ions return to the positive electrode side, and the degree of expansion of the sheets on the negative electrode side of the energy storage device is relatively reduced, causing the thickness of the energy storage device to decrease. In other words, the energy storage device shrinks during the discharge process. When the energy storage device undergoes the above-mentioned expansion and contraction, the welding strength of the various components in the energy storage device shell 200, as well as the welding strength between the energy storage device shell 200 and the top cover, will be affected.

[0035] In the test fixture 120 provided in the present application, the process of the second fixture 20 moving relative to the first fixture 10 can simulate the expansion and contraction process of the energy storage device during charging and discharging. Among them, along the height direction of the test fixture 120, the second fixture 20 moves relative to the first fixture 10 in a direction away from the first fixture 10 to simulate the expansion process of the energy storage device during charging, and the second fixture 20 moves relative to the first fixture 10 in a direction close to the first fixture 10 to simulate the contraction process of the energy storage device during discharging. The energy storage device housing 200 provided in the present application can simulate the housing and top cover of the energy storage device. During the test process, the edge portion of the energy storage device housing 200 is fixed to the first fixture 10, and the middle portion of the energy storage device housing 200 is fixed to the second fixture 20. When the second clamp 20 reciprocates relative to the first clamp 10, the middle portion of the energy storage device housing 200 reciprocates driven by the second clamp 20, thereby causing the middle portion of the energy storage device housing 200 to reciprocate relative to the edge portion of the energy storage device housing 200, causing the welding strength between the middle portion and the edge portion of the energy storage device housing 200 to change. This enables the reciprocating expansion and contraction of the winding core of the energy storage device to test the welding strength of various components of the energy storage device housing, as well as the welding strength between the housing and the top cover, which helps to improve the reliability of the energy storage device during actual use and extend the service life of the energy storage device.

[0036] The specific structures of the test fixture 120 and the energy storage device housing 200 will be described below.

[0037] Please refer to Figure 3 、 Figure 4 and Figure 5 , Figure 4 yes Figure 2 A schematic structural diagram of the first fixture 10 of the test fixture 120, Figure 5 yes Figure 4 Schematic diagram of the exploded structure of the first clamp 10 is shown.

[0038] In this embodiment, the first fixture 10 includes a support plate 11, a first clamping block 12, a first connecting member 13, a guide pin 14, a pressure plate 15 and a fixing member 16. Along the height direction of the first fixture 10 (Z-axis direction in the figure), the first clamping block 12 is installed on the side of the support plate 11 away from the second fixture 20, and the guide pin 14 and the pressure plate 15 are both located on the side of the support plate 11 facing the second fixture 20. That is, along the height direction of the first fixture 10, the first clamping block 12 and the guide pin 14 and the pressure plate 15 are respectively located on opposite sides of the support plate 11. Among them, the pressure plate 15 is arranged around the circumference of the guide pin 14. The first connecting member 13 is used to connect the first clamping block 12 and the support plate 11. The fixing member 16 is used to connect the pressure plate 15 and the support plate 11.

[0039] See also Figure 6 , Figure 6 yes Figure 5 A schematic structural diagram of the support plate 11 and the guide pin 14 in the first fixture 10 is shown.

[0040] The support plate 11 is provided with a first mounting hole 101 and a second fixing hole 102. The opening of the first mounting hole 101 is located on the surface of the support plate 11 facing away from the pressure plate 15. Specifically, the first mounting hole 101 passes through the support plate 11 along the thickness direction of the support plate 11 and is spaced apart from the guide pin 14. In this embodiment, the first mounting hole 101 is provided in the middle of the support plate 11. Exemplarily, there are two first mounting holes 101. Along the length direction of the support plate 11, the two first mounting holes 101 are spaced apart. The opening of the second fixing hole 102 is located on the surface of the support plate 11 facing the pressure plate 15, and the second fixing hole 102 is spaced apart from the first mounting hole 101. Specifically, the second fixing hole 102 passes through the support plate 11 along the thickness direction of the support plate 11. Exemplarily, there are multiple second fixing holes 102. The multiple second fixing holes 102 are all provided at the edge of the support plate 11 and are spaced apart from each other.

[0041] The guide pin 14 is located between the first mounting hole 101 and the second fixing hole 102. The length of the guide pin 14 is parallel to the direction of movement of the second clamp 20. In this embodiment, there may be multiple guide pins 14. The multiple guide pins 14 are spaced apart from each other. Exemplarily, there are two guide pins 14. The two guide pins 14 are spaced apart along the length of the first clamp 10. Exemplarily, each guide pin 14 is located between a first mounting hole 101 and a second fixing hole 102.

[0042] Please refer again to 3 and Figure 5 The first clamping block 12 is provided with a second mounting hole 121. Along the height direction of the first clamp 10, the second mounting hole 121 passes through the first clamping block 12 and is connected to the first mounting hole 101 of the support plate 11. Exemplarily, there are two second mounting holes 121. Along the length direction of the first clamp 10, the two second mounting holes 121 are spaced apart. Each second mounting hole 121 is connected to a first mounting hole 101 to facilitate the installation of the first connecting member 13.

[0043] The first connecting member 13 is disposed through the second mounting hole 121 and the first mounting hole 101, and is fixedly connected to the support plate 11 and the first clamping block 12, thereby assembling the first clamping block 12 and the support plate 11. For example, the connecting member may be a screw. In this embodiment, there are two first connecting members 13. Each first connecting member 13 is disposed through one second mounting hole 121 and one first mounting hole 101, and is fixedly connected to the support plate 11 and the first clamping block 12.

[0044] Please refer to Figure 4 and Figure 7 , Figure 7 yes Figure 4 Schematic diagram of the structure of the pressure plate 15 in the first clamp 10 is shown.

[0045] In this embodiment, the pressing plate 15 is arranged around the circumference of the second clamp 20. Specifically, the pressing plate 15 is provided with a third fixing hole 152. The third fixing hole 152 passes through the pressing plate 15 along the thickness direction of the pressing plate 15 and is connected to the second fixing hole 102. In this embodiment, there can be multiple third fixing holes 152, and the multiple third fixing holes 152 are spaced apart from each other. The pressing plate 15 includes a plurality of sub-pressing plates 151. The multiple sub-pressing plates 151 are spaced apart around the circumference of the second clamp 20 to simplify the assembly between the pressing plate 15 and the support plate 11, and reduce the assembly accuracy and assembly difficulty between the pressing plate 15 and the support plate 11. Each sub-pressing plate 151 is provided with the above-mentioned third fixing hole 152 to facilitate the assembly of the sub-pressing plate 151 and the support plate 11.

[0046] Please refer again to 3 and Figure 5 The fixing member 16 is inserted through the third fixing hole 152 of the pressure plate 15 and the second fixing hole 102 of the support plate 11, and is fixed to the support plate 11. Exemplarily, the first fixing member 16 is a screw. In this embodiment, there can be multiple first fixing members 16. Each first fixing member 16 is inserted through a third fixing hole 152 of the pressure plate 15 and a second fixing hole 102 of the support plate 11, and is fixedly connected to the support plate 11 and the pressure plate 15.

[0047] See also Figure 3 、 Figure 8 and Figure 9 , Figure 8 yes Figure 2 A schematic structural diagram of the second fixture 20 of the test fixture 120, Figure 9 yes Figure 8 Schematic diagram of the exploded structure of the second clamp 20 is shown.

[0048] In this embodiment, the second fixture 20 includes a first clamping plate 21, a second clamping plate 22, a fastener 23, a second clamping block 24, and a second connecting member 25. The first clamping plate 21 and the second clamping plate 22 are both sleeved on the guide pin 14 and spaced apart from the pressure plate 15. Along the height direction of the test fixture 120 (Z-axis direction in the figure), the first clamping plate 21 and the second clamping plate 22 are arranged opposite each other. The second clamping plate 22 is located on the side of the first clamping plate 21 that is away from the support plate 11. The second clamping block 24 is installed on the side of the second clamping plate 22 that is away from the first clamping plate 21.

[0049] See also Figure 10 , Figure 10 yes Figure 9 A schematic structural diagram of the first clamping plate 21 and the second clamping plate 22 in the second clamp 20 is shown.

[0050] The first clamping plate 21 is provided with a first guide hole 211 and a second assembly hole 212. The opening of the first guide hole 211 is located on the surface of the first clamping plate 21 facing the support plate 11. In this embodiment, the first guide hole 211 penetrates the first clamping plate 21 along the thickness direction of the first clamping plate 21. There may be multiple first guide holes 211. Multiple first guide holes 211 are spaced apart from each other. For example, there are two first guide holes 211. Along the length direction of the first clamping plate 21, the two first guide holes 211 are spaced apart.

[0051] The second assembly hole 212 passes through the first splint 21 along the thickness direction of the first splint 21 and is spaced apart from the first guide hole 211. In this embodiment, there can be multiple second assembly holes 212. Multiple second assembly holes 212 are spaced apart from each other. For example, there are four second assembly holes 212. The four second assembly holes 212 can be divided into two groups. Along the width direction of the first splint 21 (the Y-axis direction shown in the figure), the two groups of second assembly holes 212 are respectively located on opposite sides of the first guide hole 211. Each group includes two second assembly holes 212. Along the length direction of the first splint 21 (the X-axis direction shown in the figure), the two second assembly holes 212 of each group are spaced apart.

[0052] The second clamping plate 22 is provided with a third mounting hole 221, a third guide hole 222 and a third assembly hole 223. Among them, the opening of the third mounting hole 221 is located on the surface of the second clamping plate 22 away from the first clamping plate 21. Specifically, the third mounting hole 221 penetrates the second clamping plate 22 along the thickness direction of the second clamping plate 22. In this embodiment, the third mounting hole 221 is provided in the middle part of the second clamping plate 22. Exemplarily, there are two third mounting holes 221. Along the length direction of the second clamping plate 22 (X-axis direction in the figure), the two third mounting holes 221 are spaced apart.

[0053] The third assembly hole 223 passes through the second splint 22 along the thickness direction of the second splint 22 and is spaced apart from the third mounting hole 221. In this embodiment, there can be multiple third assembly holes 223. Multiple third assembly holes 223 are all provided at the edge of the second splint 22 and are spaced apart from each other. Exemplarily, there are four third assembly holes 223. The four third assembly holes 223 can be divided into two groups. Along the width direction of the second splint 22 (the Y-axis direction shown in the figure), the two groups of third assembly holes 223 are spaced apart and on opposite sides. Each group includes two third assembly holes 223. Along the length direction of the second splint 22 (the X-axis direction shown in the figure), the two third assembly holes 223 of each group are spaced apart. Each third assembly hole 223 is connected to a second assembly hole 212 of the first splint 21 to facilitate installation on the fastener 23.

[0054] In this embodiment, the opening of the third guide hole 222 is located on the surface of the second splint 22 facing the first splint 21. Specifically, the third guide hole 222 penetrates the second splint 22 along the thickness direction of the second splint 22, and is spaced apart from the third mounting hole 221 and the third assembly hole 223. There can be multiple third guide holes 222. The multiple third guide holes 222 are all located at the edge of the second splint 22 and are spaced apart from each other. Along the width direction of the second splint 22 (the Y-axis direction in the figure), the multiple third guide holes 222 are located between the two groups of third assembly holes 223. Exemplarily, there are two third guide holes 222. Along the length direction of the second splint 22 (the X-axis direction in the figure), the two third guide holes 222 are spaced apart. Exemplarily, along the length direction of the second splint 22 (the X-axis direction in the figure), the two third guide holes 222 are respectively located on opposite sides of the third mounting hole 221. Each third guide hole 222 is communicated with one first guide hole 211 of the first clamping plate 21 to facilitate installation of the guide pin 14 .

[0055] When the second fixture 20 is assembled with the first fixture 10, the end of each guide pin 14 of the first fixture 10 away from the support plate 11 extends into the first guide hole 211 of the first clamp 21. Specifically, each guide pin 14 is provided in the first guide hole 211 of the first clamp 21 and extends into the third guide hole 222 of the second clamp 22. In this embodiment, each guide pin 14 is provided in the first guide hole 211 and the third guide hole 222. It can be understood that when the second fixture 20 moves relative to the first fixture 10 along the height of the test fixture 120, the guide pin 14 can play a guiding role to prevent the second fixture 20 from deviating during the movement. On this basis, by arranging a plurality of guide pins 14 on the support plate 11, the second fixture 20 can be prevented from rotating around the height direction of the test fixture 120 during the movement, thereby ensuring that the test results of the test fixture 120 are accurate.

[0056] Please refer to Figure 3 and Figure 9 The fastener 23 is inserted through the third assembly hole 223 of the second clamping plate 22 and the second assembly hole 212 of the first clamping plate 21, and is fixed to the first clamping plate 21. For example, the fastener 23 may be a screw. In this embodiment, there may be multiple fasteners 23. Each fastener 23 is inserted through one third assembly hole 223 and one second assembly hole 212, and is fixedly connected to the first clamping plate 21 and the second clamping plate 22.

[0057] In this embodiment, the second clamping block 24 is provided with a fourth mounting hole 241. This fourth mounting hole 241 extends through the second clamping block 24 along the height direction of the second fixture 20 (the Z-axis direction in the figure) and communicates with the third mounting hole 221 of the second clamping plate 22, facilitating the installation of the second connector 25. Exemplarily, there are two fourth mounting holes 241. These two fourth mounting holes 241 are spaced apart from each other. Each first mounting hole 101 communicates with a third mounting hole 221.

[0058] The second connecting member 25 is inserted through the fourth mounting hole 241 of the second clamping block 24 and the third mounting hole 221 of the second clamping plate 22, and is fixed to the second clamping plate 22, thereby assembling the second clamping block 24 and the second clamping plate 22. For example, the second connecting member 25 is a screw. In this embodiment, there are two second connecting members 25. Each second connecting member 25 is inserted through one fourth mounting hole 241 and one third mounting hole 221, and is fixed to the second clamping plate 22.

[0059] Please refer to Figure 3 、 Figure 11 and Figure 12 , Figure 11 yes Figure 2 A schematic structural diagram of the energy storage device housing 200, Figure 12 yes Figure 11 The structure diagram of the energy storage device housing 200 after being cut open along line BB is shown.

[0060] In this embodiment, the energy storage device housing 200 includes a fixed plate 210 and a movable plate 220. The fixed plate 210 is welded to the movable plate 220 and surrounds the movable plate 220. The movable plate 220 simulates the side panels of the energy storage device housing in the direction of expansion of the energy storage device. Furthermore, the movable plate 220 includes a main body 30 and a connecting portion 40, which surrounds and connects to the main body 30.

[0061] The movable plate 220 is further provided with a first assembly hole 31 and a second guide hole 32. Specifically, the first assembly hole 31 and the second guide hole 32 are both provided in the main body 30. The first assembly hole 31 and the second guide hole 32 both extend through the movable plate 220 along the thickness direction of the main body 30 of the movable plate 220 and are spaced apart from each other. The second guide hole 32 is connected to both the first guide hole 211 and the third guide hole 222 to facilitate installation of the guide pin 14. In this embodiment, there may be multiple second guide holes 32. The multiple second guide holes 32 are spaced apart from each other. For example, there are two second guide holes 32. The two second guide holes 32 are spaced apart along the length direction of the energy storage device housing 200 (the X-axis direction in the figure). Each second guide hole 32 is connected to both one first guide hole 211 and one third guide hole 222. When the movable plate 220 of the energy storage device housing 200 is clamped between the first clamping plate 21 and the second clamping plate 22 of the second fixture 20, the movable plate 220 is also sleeved onto the multiple guide pins 14. That is, each guide pin 14 is further passed through a second guide hole 32 of the movable plate 220 .

[0062] Under this arrangement, when the movable plate 220 of the energy storage device housing 200 moves along the height direction of the test fixture 120 driven by the second fixture 20, the guide pins 14 can also guide the movement of the movable plate 220, preventing the movable plate 220 from deflecting during movement. At the same time, the movable plate 220 can be prevented from rotating about the height direction of the test fixture 120 during movement, ensuring that the pulling and cracking of the connection between the movable plate 220 and the fixed plate 210 is only caused by the movement of the movable plate 220, thereby helping to ensure the high accuracy of the test results of the test fixture 120.

[0063] The first assembly hole 31 is connected to the second assembly hole 212 and the third assembly hole 223 to facilitate installation on the fastener 23. In this embodiment, there can be multiple first assembly holes 31, and the multiple first assembly holes 31 are spaced apart from each other. For example, there are four first assembly holes 31. The four first assembly holes 31 can be divided into two groups. Along the width direction of the energy storage device housing 200 (the Y-axis direction in the figure), the two groups of first assembly holes 31 are respectively located on opposite sides of the second guide hole 32. Each group includes two first assembly holes 31. Along the length direction of the third splint (the X-axis direction in the figure), the two first assembly holes 31 of each group are spaced apart. Each first assembly hole 31 is connected to a second assembly hole 212 of the first splint 21 and a third assembly hole 223 of the second splint 22. It is understood that the fasteners 23 are screws. When securing the movable plate 220 of the energy storage device housing 200 to the second fixture 20, the fasteners 23 can be removed first. After clamping the movable plate 220 of the energy storage device housing 200 between the first clamping plate 21 and the second clamping plate 22 of the second clamping plate 20, the fasteners 23 can be assembled with the first clamping plate 21, the second substrate, and the movable plate 220 of the energy storage device housing 200. At this point, each fastener 23 is inserted through a third assembly hole 223 of the second clamping plate 22, a first assembly hole 31 of the movable plate 220, and a second assembly hole 212 of the first clamping plate 21, and secured to the first clamping plate 21, thereby achieving assembly of the movable plate 220 of the energy storage device housing 200 with the second clamping plate 20.

[0064] The fixed plate 210 is connected to the connecting portion 40 and is arranged around the circumference of the connecting portion 40. The fixed plate 210 is used to simulate the top cover of the energy storage device and the side shell of the outer shell of the energy storage device perpendicular to the expansion direction of the energy storage device. Specifically, the fixed plate 210 includes a first part 50 and a plurality of second parts 60 that are connected. The first part 50 is welded to the connecting portion 40 of the movable plate 220 and is arranged around the connecting portion 40 of the movable plate 220. The plurality of second parts 60 are all fixedly connected to the side of the first part 50 away from the connecting portion 40 and are spaced apart around the first part 50. Each second part 60 is arranged to intersect with the first part 50. Exemplarily, each second part 60 is perpendicular to the first part 50.

[0065] The fixing plate 210 is provided with a first fixing hole 201. Specifically, each second portion 60 of the fixing plate 210 is provided with a first fixing hole 201. In this embodiment, the first fixing hole 201 penetrates the second portion 60 of the fixing plate 210 along the thickness direction of each second portion 60 of the fixing plate 210 and communicates with both the second fixing hole 102 and the third fixing hole 152 to facilitate installation of the fixing member 16. For example, there may be multiple first fixing holes 201. The multiple first fixing holes 201 are spaced apart from each other. Each first fixing hole 201 communicates with one second fixing hole 102 and one third fixing hole 152. It is understood that the fixing member 16 is a screw. When the fixing plate 210 of the energy storage device housing 200 is fixed to the first clamp 10, the fixing member 16 can be removed first, and the fixing plate 210 of the energy storage device housing 200 is clamped between the support plate 11 and the pressure plate 15 of the first clamp 10. Then, the fixing member 16 is assembled with the pressure plate 15, the support plate 11, and the fixing plate 210 of the energy storage device housing 200. In particular, each sub-pressing plate 151 of the pressure plate 15 and the support plate 11 are used to clamp a second portion 60 of the fixing plate 210 to improve the assembly stability between the fixing plate 210, the pressure plate 15, and the support plate 11. At this time, each fixing member 16 is inserted into a third fixing hole 152 of the pressure plate 15, a first fixing hole 201 of the fixing plate 210 and a second fixing hole 102 of the support plate 11, and is fixed to the support plate 11, so that the fixing plate 210 of the energy storage device housing 200 and the first clamp 10 are assembled.

[0066] After the energy storage device housing 200 and the test fixture 120 are assembled, the second clamp 113 of the tensile machine 110 is used to drive the second fixture 20 to reciprocate relative to the first fixture 10 along the height direction of the test fixture 120. Specifically, during the test, the first clamp 112 of the tensile machine 110 remains stationary to keep the first fixture 10 stationary. That is, the fixed plate 210 of the energy storage device housing 200 remains stationary during the test. Along the height direction of the test fixture 120, the second fixture 20 moves relative to the first fixture 10 in a direction away from the first fixture 10 under the drive of the second clamp 113 of the tensile machine 110. Exemplarily, along the height direction of the test fixture 120, the second fixture 20 moves 4.5 mm relative to the first fixture 10 in a direction away from the first fixture 10 under the drive of the second clamp 113 of the tensile machine 110 to simulate the expansion of the winding core of the energy storage device when the energy storage device is initially fully charged. During this process, the main body 30 of the movable plate 220, driven by the second fixture 20, moves along the height of the test fixture 120, away from the fixed plate 210. This simulates the effect of the expansion of the energy storage device's winding core upon initial full charge on the weld strength between the side panels and side shells of the device's housing, as well as the weld strength between the side panels and top cover. At this time, the connecting portion 40 of the movable plate 220 is pulled.

[0067] Then, along the height direction of the test fixture 120, the second fixture 20 is driven by the second clamp 113 of the tensile machine 110 to reciprocate relative to the first fixture 10 to simulate the expansion and contraction of the core of the energy storage device during the charging and discharging process. In this embodiment, along the height direction of the test fixture 120, the second fixture 20 is driven by the second clamp 113 of the tensile machine 110 to move 2.75 mm relative to the first fixture 10 in a direction close to the first fixture 10 to simulate the contraction of the core of the energy storage device after the energy storage device is discharged. Along the height direction of the test fixture 120, the second fixture 20 is driven by the second clamp 113 of the tensile machine 110 to move 2.75 mm relative to the first fixture 10 in a direction away from the first fixture 10 to simulate the expansion of the core of the energy storage device after the energy storage device is charged. During this process, the main body 30 of the movable plate 220, driven by the second fixture 20, reciprocates relative to the fixed plate 210 along the height of the test fixture 120. This causes repeated pulling of the connecting portion 40 of the movable plate 220. The tester then inspects the connecting portion 40 for cracks, either visually or at the weld between the connecting portion 40 and the fixed plate 210. If cracks are detected, the test is terminated and the test result is obtained.

[0068] In this embodiment, the support plate 11 and the pressure plate 15 of the first clamp 10 clamp the fixed plate 210 of the energy storage device housing 200, and the first clamp 21 and the second clamp 22 of the second clamp 20 clamp the movable plate 220 of the energy storage device housing 200. When the second clamp 20 reciprocates relative to the first clamp 10, the main body 30 of the movable plate 220 can reciprocate relative to the fixed plate 210 driven by the second clamp 20. During this process, the connection portion 40 of the movable plate 220 will crack due to repeated pulling. Under this setting, it is possible to simulate the effect of the reciprocating changes of the expansion and contraction of the winding core of the energy storage device during the charging and discharging process on the welding strength between the various structures in the shell of the energy storage device, as well as the welding strength between the shell and the top cover. This can help R&D personnel improve the structure of the energy storage device during the development of the energy storage device, improve the reliability of the energy storage device during actual use, and extend the service life of the energy storage device. At the same time, compared with directly testing the welding strength of the processed energy storage device, the present application uses the test tool 120 to perform simulation testing on the energy storage device shell 200, which also helps to save R&D costs and achieve cost reduction and efficiency improvement.

[0069] The above description is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. The embodiments of the present application and the features of the embodiments can be combined with each other unless there is a conflict. Therefore, the scope of protection of the present application shall be based on the scope of protection of the claims.

Claims

1. A test fixture for detecting the welding strength of an energy storage device housing, wherein the energy storage device housing includes a fixed plate and a movable plate, the fixed plate being welded to the movable plate and disposed around the movable plate, the movable plate being provided with a first assembly hole, the first assembly hole penetrating the movable plate along the thickness direction of the movable plate, characterized in that: The test fixture includes a first fixture and a second fixture, and the first fixture and the second fixture are arranged opposite to each other along the height direction of the test fixture. The first fixture includes a support plate and a pressure plate. Along the height direction of the test fixture, the pressure plate is located on the side of the support plate facing the second fixture, and the pressure plate is arranged around the second fixture. The pressure plate and the support plate are used to clamp the fixed plate, and the second fixture can move relative to the first fixture along the height direction of the test fixture. The second fixture includes a first clamping plate, a second clamping plate and a fastener. Along the height direction of the test fixture, the first clamping plate and the second clamping plate are arranged opposite to each other, and the first clamping plate and the second clamping plate are arranged opposite to each other. A clamping plate and a second clamping plate are used to clamp the movable plate and can drive the movable plate to move relative to the fixed plate along the height direction of the test fixture, wherein the first clamping plate is provided with a second assembly hole, the opening of the second assembly hole is located on the surface of the first clamping plate facing the second clamping plate, and the second assembly hole is connected to the first assembly hole, the second clamping plate is provided with a third assembly hole, the third assembly hole passes through the second clamping plate along the thickness direction of the second clamping plate and is connected to the first assembly hole, the fastener is passed through the third assembly hole, the first assembly hole and the second assembly hole, and is fixedly connected to the first clamping plate and the second clamping plate.

2. The test fixture according to claim 1, characterized in that: The first clamping plate is provided with a first guide hole, and the opening of the first guide hole is located on the surface of the first clamping plate facing the support plate; The test fixture further includes a guide pin, which is fixedly connected to a side of the support plate facing the second fixture and extends into the first guide hole, wherein a length direction of the guide pin is parallel to a movement direction of the second fixture.

3. The test fixture according to claim 2, characterized in that: The first guide hole penetrates the first clamping plate along the thickness direction of the first clamping plate; The movable plate is provided with a second guide hole, the second guide hole passes through the movable plate along the thickness direction of the movable plate and is communicated with the first guide hole; The second clamping plate is further provided with a third guide hole, the opening of the third guide hole is located on the surface of the second clamping plate facing the first clamping plate, and the third guide hole is connected to the second guide hole; The guide pin passes through the first guide hole and the second guide hole, and extends into the third guide hole.

4. The test fixture according to claim 3, characterized in that: There are a plurality of first guide holes, and the plurality of first guide holes are spaced apart from each other; There are a plurality of second guide holes, the plurality of second guide holes are spaced apart from each other, and each second guide hole is connected to one first guide hole; There are a plurality of third guide holes, the plurality of third guide holes are spaced apart from each other, and each of the third guide holes is connected to one of the second guide holes; There are a plurality of guide pins, and the plurality of guide pins are spaced apart from each other. Each guide pin is passed through one of the first guide holes and one of the second guide holes, and extends into one of the third guide holes.

5. The test fixture according to any one of claims 1 to 4, characterized in that: The fixing plate is provided with a first fixing hole, and the first fixing hole penetrates the fixing plate along the thickness direction of the fixing plate; The support plate is provided with a second fixing hole, the opening of the second fixing hole is located on the surface of the support plate facing the pressure plate, and the second fixing hole is connected to the first fixing hole; The pressing plate is provided with a third fixing hole, the third fixing hole passes through the pressing plate along the thickness direction of the pressing plate and is communicated with the first fixing hole; The first clamp further includes a fixing member, which is passed through the third fixing hole, the first fixing hole, and the second fixing hole, and is fixedly connected to the support plate and the pressing plate.

6. The test fixture according to claim 1, characterized in that: The pressing plate includes a plurality of sub-pressing plates, and the plurality of sub-pressing plates are arranged at intervals around the circumference of the second clamp.

7. The test fixture according to claim 6, characterized in that: The fixed plate includes a first portion and a plurality of second portions, wherein the first portion is welded to the movable plate and arranged around the movable plate, and the plurality of second portions are fixedly connected to a side of the first portion facing away from the movable plate and are spaced around the first portion; Each of the sub-pressing plates and the supporting plate is used to clamp one second part.

8. The test fixture according to claim 1, characterized in that: The first clamp further includes a first clamping block, which is fixedly connected to a side of the support plate facing away from the pressing plate, and the first clamping block is used to connect to a tensile testing machine.

9. The test fixture according to claim 1, characterized in that: The second clamp further includes a second clamping block, which is fixedly connected to a side of the second clamping plate facing away from the first clamping plate, and the second clamping block is used to connect to the tensile testing machine.

10. A testing device, characterized in that: It comprises a tensile testing machine and a test fixture as described in any one of claims 1 to 8, wherein the tensile testing machine is used to connect the first fixture and the second fixture, and drive the second fixture to move relative to the first fixture along the height direction of the test equipment.

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