Compression resistance testing tool and compression resistance testing system

Abstract

The utility model relates to the technical field of battery safety testing, in particular to a compression resistance testing tool which comprises a supporting assembly and an extruding assembly. The supporting assembly is provided with a containing cavity used for containing a to-be-detected battery cell, and the pole and shoulder height positions of the to-be-detected battery cell protrude out of the supporting assembly. The extrusion assembly is arranged corresponding to the supporting assembly, comprises an extrusion part and is connected to the pressure applying equipment, so that the pressure applying equipment can drive the extrusion part to move in the first direction to extrude the pole or shoulder height position of the to-be-detected battery cell. By using the compression resistance test tool, the actual battery cell can be used as a test object, whether the positive and negative tabs are in lap joint and short circuit, the deformation condition of the side wall of the battery cell and the like after the pole and the shoulder position of the battery cell are pressed can be detected, and the compression resistance characteristics of the pole and the shoulder position of the battery cell can be known more comprehensively. The utility model further provides a compression resistance testing system which comprises pressure applying equipment and the compression resistance testing tool, and the pressure applying end of the pressure applying equipment is connected to the extrusion part.

Description

Technical Field

[0001] The utility model relates to the technical field of battery safety testing, in particular to a compressive testing tooling and a compressive testing system. Background Art

[0002] In a vehicle, it is inevitable that the battery pack will be stepped on inside the vehicle. If the strength of the battery pack housing and the carriage is insufficient, the pole columns and shoulder heights of the battery cells will be squeezed, posing a safety risk to the battery pack. In the prior art, for the compressive test of the pole columns and shoulder heights of the battery cells, a press is used to test a single cover plate instead of actually testing the battery cells, and it is impossible to detect whether the positive and negative electrode tabs will overlap and short-circuit and the deformation of the side walls of the battery cells after being pressed.

[0003] Therefore, there is an urgent need for a compressive testing tooling and a compressive testing system to solve the above problems. Summary of the Utility Model

[0004] An object of the utility model is to provide a compressive testing tooling, which can assist in detecting whether the positive and negative electrode tabs of a battery cell will overlap and short-circuit and the deformation of the side walls of the battery cell after the pole columns and shoulder heights of the battery cell are pressed.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] Provide a compressive testing tooling, including:

[0007] A support assembly, the support assembly has a receiving cavity for receiving a battery cell to be tested, and the pole columns and shoulder heights of the battery cell to be tested protrude from the support assembly;

[0008] An extrusion assembly, arranged corresponding to the support assembly, the extrusion assembly includes an extrusion member, and the extrusion assembly is connected to a pressing device so that the pressing device can drive the extrusion member to move along a first direction to extrude the pole column or shoulder height of the battery cell to be tested.

[0009] Optionally, the support assembly includes a base and a pressing plate, the pressing plate is movably connected to the side wall of the base, and the pressing plate can move relative to the base along a second direction.

[0010] Optionally, there are two pressing plates arranged oppositely, and the two pressing plates are respectively movably connected to two opposite side walls of the base.

[0011] Optionally, the support assembly further includes a threaded rod, a threaded hole is formed in the side wall of the base, the threaded rod is matched with the threaded hole, and one end of the threaded rod is rotatably connected to the pressing plate.

[0012] Optionally, the extrusion assembly further includes a base member connected to the pressing device, and the extrusion member is movably connected to the base member and can move relative to the base member in a third direction.

[0013] Optionally, a guiding hole is formed in the base member and extends along the third direction. The extrusion assembly further includes an adjusting screw and a locking nut. One end of the adjusting screw is connected to the extrusion member, and the other end passes through the guiding hole and cooperates with the locking nut.

[0014] Optionally, a plurality of extrusion members are provided, and the plurality of extrusion members are arranged at intervals and can all move relative to the base member in the third direction.

[0015] Another object of the present invention is to provide a compressive strength testing system that can detect whether the positive and negative electrode tabs of the battery cell will be short-circuited due to the compression of the pole column and shoulder height positions of the battery cell, and the deformation of the side wall of the battery cell, etc.

[0016] To achieve this purpose, the present invention adopts the following technical solutions:

[0017] Provide a compressive strength testing system, including a pressing device and the above-mentioned compressive strength testing tooling, and the pressing end of the pressing device is connected to the extrusion member.

[0018] Optionally, a first pressure sensor is further included, and the first pressure sensor is arranged on the side wall of the pressure-receiving plate in contact with the battery cell to be tested;

[0019] And / or, a second pressure sensor is further included, and the second pressure sensor is arranged on the end face of the extrusion member pressing the pole column or shoulder height position of the battery cell to be tested.

[0020] Optionally, a CT detection device is further included, and the CT detection device is used to detect the internal structure of the battery cell to be tested.

[0021] The beneficial effects of the present invention:

[0022] The present invention provides a compressive strength testing tooling, including a support assembly and an extrusion assembly. Among them, the support assembly has a receiving cavity for receiving the battery cell to be tested, and the pole column and shoulder height positions of the battery cell to be tested protrude from the support assembly. The extrusion assembly is arranged corresponding to the support assembly, and the extrusion assembly includes an extrusion member. The extrusion assembly is connected to the pressing device so that the pressing device can drive the extrusion member to move in a first direction to press the pole column or shoulder height position of the battery cell to be tested. Using this compressive strength testing tooling can use the actual battery cell as the test object, so as to detect whether the positive and negative electrode tabs of the battery cell will be short-circuited due to the compression of the pole column and shoulder height positions of the battery cell, and the deformation of the side wall of the battery cell, etc., and thus can understand the more comprehensive compressive characteristics of the pole column and shoulder height positions of the battery cell.

[0023] The present utility model also provides a compressive strength testing system, which includes a pressing device and the above-mentioned compressive strength testing tooling. The pressing end of the pressing device is connected to the pressing member. This compressive strength testing system can detect whether the positive and negative electrode tabs of the battery cell will overlap and short-circuit, and the deformation condition of the side wall of the battery cell, etc. after the pole column and shoulder height position of the battery cell are pressed. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the compressive strength testing tooling from the first perspective provided by the embodiment of the present utility model;

[0025] Figure 2 is a schematic structural diagram of the compressive strength testing tooling from the second perspective provided by the embodiment of the present utility model.

[0026] In the figure:

[0027] 1. Support assembly; 11. Base; 12. Pressure plate; 13. Threaded rod; 14. Fixed nut; 101. Accommodation cavity;

[0028] 2. Extrusion assembly; 21. Extrusion member; 22. Base member; 221. Guide hole; 23. Locking nut; 24. Connecting member. Detailed Embodiments

[0029] The technical solution of the present utility model will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model are shown in the drawings, rather than all of them.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0032] As Figure 1 - Figure 2 shown, the compression test tooling of this embodiment includes a support assembly 1 and a pressing assembly 2. Among them, the support assembly 1 is used to accommodate the battery cell to be tested, the pressing assembly 2 is arranged corresponding to the support assembly 1, and the pressing assembly 2 is used to press the pole column or the shoulder height position of the battery cell to be tested. Specifically, the support assembly 1 has a receiving cavity 101, the receiving cavity 101 is used to accommodate the battery cell to be tested, and the pole column and the shoulder height position of the battery cell to be tested protrude from the support assembly 1. The pressing assembly 2 includes a pressing member 21, and the pressing assembly 2 is connected to a pressure-applying device so that the pressure-applying device can drive the pressing member 21 to move in a first direction to press the pole column or the shoulder height position of the battery cell to be tested. Figure 1 The ab direction in

[0033] is the first direction, the cd direction is the second direction, and the ef direction is the third direction. In this embodiment, the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0034] Optionally, the support assembly 1 includes a base 11 and a pressing plate 12. The pressing plate 12 is movably connected to the side wall of the base 11, and the pressing plate 12 can move relative to the base 11 in the second direction. By adjusting the position of the pressing plate 12 relative to the base 11 in the second direction, the size of the receiving cavity 101 in the second direction can be adjusted, so as to adapt to battery cells to be tested of different specifications. The pressing plate 12 contacts the battery cell to be tested in the second direction, and the position of the battery cell to be tested in the second direction can be fixed, preventing the battery cell to be tested from moving during the compression test and causing incorrect test results.

[0035] Optionally, there are two pressing plates 12 arranged oppositely, and the two pressing plates 12 are respectively movably connected to two oppositely arranged side walls of the base 11.

[0036] To facilitate adjusting the position of the pressing plate 12 relative to the base 11, optionally, in this embodiment, the support assembly 1 further includes a threaded rod 13. A threaded hole is formed in the side wall of the base 11, and the threaded rod 13 is engaged with the threaded hole. One end of the threaded rod 13 is rotatably connected to the pressing plate 12. Of course, in other embodiments, the threaded rod 13 and the pressing plate 12 can also be set to be separate. That is, the threaded rod 13 is adjusted so that the end of the threaded rod 13 abuts against the surface of the pressing plate 12 facing away from the battery cell to be tested, so as to support the pressing plate 12 to fixedly support the side surface of the battery cell to be tested.

[0037] Optionally, the support assembly 1 further includes a fixing nut 14. The fixing nut 14 is fixedly connected to the side wall of the base 11 and is coaxially arranged with the threaded hole. The fixing nut 14 further locks the threaded rod 13 to ensure that the threaded rod 13 will not rotate under force during the compressive test.

[0038] Optionally, the side wall of the pressing plate 12 facing the battery cell to be tested is attached to the side wall of the battery cell to be tested to ensure balanced support force for the battery cell to be tested. In this embodiment, the battery cell to be tested is a cuboid-shaped battery cell, then the side wall of the pressing plate 12 facing the battery cell to be tested is a plane. In other embodiments, if the battery cell to be tested is a cylindrical battery cell, then the side wall of the pressing plate 12 facing the battery cell to be tested is set to a corresponding curved surface.

[0039] Optionally, the pressing assembly 2 further includes a base member 22. The base member 22 is connected to the pressing device, and the pressing member 21 is movably connected to the base member 22. The pressing member 21 can move relative to the base member 22 along the third direction to align with the pole column or shoulder height position of the battery cell to be tested.

[0040] Optionally, a guiding hole 221 is formed in the base member 22. The guiding hole 221 extends along the third direction. The pressing assembly 2 further includes an adjusting screw and a locking nut 23. One end of the adjusting screw is connected to the pressing member 21, and the other end passes through the guiding hole 221 and is engaged with the locking nut 23. The locking nut 23 is used to lock the position of the adjusting screw relative to the guiding hole 221.

[0041] Optionally, a plurality of guiding holes 221 are provided on the base member 22. One pressing member 21 is connected with a plurality of adjusting screws. The plurality of adjusting screws are respectively inserted into the plurality of guiding holes 221 and are respectively arranged corresponding to the plurality of locking nuts 23. Optionally, the plurality of adjusting screws are sequentially arranged at intervals along the second direction to increase the force-bearing positions of the pressing member 21 and make the force more balanced.

[0042] Optionally, a plurality of pressing members 21 are provided. The plurality of pressing members 21 are arranged at intervals, and the plurality of pressing members 21 can all move relative to the base member 22 along the third direction. In this embodiment, two pressing members 21 are provided, so that the compressive tests on the two pole columns or the shoulder height positions on both sides of the battery cell to be tested can be carried out at the same time, improving the test efficiency.

[0043] Optionally, the pressing assembly 2 includes a connecting member 24 disposed on the side of the base member 22 away from the battery cell to be tested. The connecting member 24 is screwed to the base member 22 and is used to connect the pressing device. An assembly hole is formed in the connecting member 24 to adapt to the pressing end of the pressing device.

[0044] This embodiment also provides a compressive test system, including a pressing device and the above-mentioned compressive test tooling. The pressing end of the pressing device is connected to the pressing member 21.

[0045] Optionally, the compressive test system further includes a first pressure sensor disposed on the side wall of the pressure-receiving plate 12 in contact with the battery cell to be tested, so as to detect the pressure-bearing condition of the side wall of the battery cell when the pole column and shoulder height position of the battery cell are pressed.

[0046] Optionally, the compressive test system further includes a second pressure sensor disposed on the end face of the pressing member 21 pressing the pole column or shoulder height position of the battery cell to be tested, that is, to correct the pressure value of the pressing device.

[0047] Optionally, the compressive test system further includes a CT detection device for detecting the internal structure of the battery cell to be tested, so as to conveniently check whether the internal structure of the battery cell is damaged, such as whether the positive and negative electrode tabs of the battery cell are overlapped and short-circuited, and whether the positive and negative electrode tabs are torn.

[0048] The compressive detection process of the compressive test system is as follows:

[0049] First, adjust the positions of the pressing member 21 in the first direction and the third direction according to the pole column and shoulder height positions of the battery cell to be tested. Then place the battery cell to be tested between the two pressure-receiving plates 12, and the battery cell to be tested can be placed by simulating a similar structure in the battery module. Adjust the distance between the two pressure-receiving plates 12 according to the size of the battery cell to be tested in the second direction to support the battery cell to be tested. Operate the pressing device to apply a pressing force in the range of 1000N - 2000N to the test position of the battery cell to be tested, that is, the pole column or shoulder height position, at a speed controlled at 1mm / min and maintain it for 30 minutes. After completion, take out the battery cell to be tested, and use the CT detection device to confirm the state of the internal structure of the battery cell to be tested, whether there is ear overlap or tearing. And manually observe whether there is obvious collapse on the outer shell of the battery cell to be tested, measure the deformation amount, and observe whether the pole column is wire-drawn and short-circuited. Then, the structural design of the battery cell can be adjusted according to the compressive test results, and the battery cell, battery module, and battery pack can be optimized to ensure the structural strength of the product, thereby ensuring the quality and safety of the product and reducing after-sales costs.

[0050] The compression test system can detect whether the positive and negative electrode tabs of the battery cell will be short-circuited due to the compression of the terminal post and shoulder height position of the battery cell, the deformation of the side wall of the battery cell, etc., and provide reliable detection data for the structural optimization of the battery cell, battery module and battery pack.

[0051] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. Compression test tool, characterized in that: include: A support assembly (1), the support assembly (1) having a receiving cavity (101), the receiving cavity (101) being used to receive a cell to be tested, the pole and shoulder height of the cell to be tested protruding out of the support assembly (1); An extrusion assembly (2) is arranged corresponding to the support assembly (1), the extrusion assembly (2) comprising an extrusion piece (21), the extrusion assembly (2) being connected to a pressure device so that the pressure device can drive the extrusion piece (21) to move along a first direction to squeeze the pole or shoulder height position of the battery cell to be tested.

2. The compression test tool according to claim 1, characterized in that: The support assembly (1) comprises a base (11) and a pressure plate (12); the pressure plate (12) is movably connected to a side wall of the base (11); and the pressure plate (12) is capable of moving along a second direction relative to the base (11).

3. The compression test tool according to claim 2, characterized in that: Two pressing plates (12) are arranged opposite to each other, and the two pressing plates (12) are movably connected to two oppositely arranged side walls of the base (11).

4. The compression test tool according to claim 2, characterized in that: The support assembly (1) further comprises a threaded rod (13). A threaded hole is provided on the side wall of the base (11). The threaded rod (13) matches the threaded hole. One end of the threaded rod (13) is rotatably connected to the pressure plate (12).

5. The compression test tool according to claim 1, characterized in that: The extrusion assembly (2) further comprises a base member (22), wherein the base member (22) is connected to the pressure device, the extrusion member (21) is movably connected to the base member (22), and the extrusion member (21) is movable along a third direction relative to the base member (22).

6. The compression test tool according to claim 5, characterized in that: The base member (22) is provided with a guide hole (221), and the guide hole (221) extends along the third direction. The extrusion assembly (2) also includes an adjusting screw and a locking nut (23), one end of the adjusting screw is connected to the extrusion member (21), and the other end passes through the guide hole (221) and cooperates with the locking nut (23).

7. The compression test tool according to claim 5, characterized in that: A plurality of the extrusion members (21) are provided, the plurality of the extrusion members (21) are arranged at intervals, and the plurality of the extrusion members (21) are all capable of moving along the third direction relative to the base member (22).

8. Compression test system, characterized in that: It comprises a pressure-applying device and a compression test fixture as claimed in any one of claims 1 to 7, wherein the pressure-applying end of the pressure-applying device is connected to an extrusion piece (21).

9. The compression test system according to claim 8, characterized in that: It also includes a first pressure sensor, which is arranged on the side wall of the pressure plate (12) that contacts the battery cell to be tested; And / or, it also includes a second pressure sensor, which is arranged on the end surface of the extrusion piece (21) at the pole or shoulder height position of the battery cell to be tested.

10. The compression test system according to claim 8, characterized in that: It also includes a CT detection device, which is used to detect the internal structure of the battery cell to be tested.

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