Testing device

Abstract

A test device that can be used to test the expansion force of batteries, such as motor vehicle batteries, such as fuel vehicle batteries, hybrid vehicle batteries and battery of pure electric vehicles, comprises: a first plate, a second plate, a third plate arranged parallel to one another; the first flat plate, the second flat plate and the third flat plate are used for connecting the first flat plate, the second flat plate and the third flat plate together, and a first space formed between the first flat plate and the second flat plate is used for arranging a battery module to be tested; a force sensor is arranged in a second space formed between the second flat plate and the third flat plate, and the second flat plate can freely translate along the connecting pieces. The testing device provided by the utility model can be used for obtaining expansive force data when the battery is in thermal runaway, so that the expansive force data can be used as an index of battery module framework design.

Description

Technical Field

[0001] Generally speaking, the present utility model relates to a testing device. More specifically, the present utility model relates to a testing device for testing the expansion force of a battery during thermal runaway, and the battery may be, for example, a motor vehicle battery, which may include, for example, a fuel vehicle battery, a hybrid vehicle battery, and a battery of a pure electric vehicle. Background Art

[0002] Motor vehicle batteries are important components widely used in motor vehicles. Motor vehicle batteries may include, for example, fuel vehicle batteries, hybrid vehicle batteries, and batteries of pure electric vehicles.

[0003] To date, there is no method or device in the industry for specifically testing the expansion force of a motor vehicle battery during thermal runaway.

[0004] If the expansion force of a motor vehicle battery during thermal runaway exceeds the limit, it may cause damage to the battery module or battery pack structure. The damage to the battery module or battery pack structure will cause various adverse consequences to varying degrees, which is thus undesirable. Summary of the Utility Model

[0005] The inventors of the present utility model anticipate that testing the expansion force of a motor vehicle battery, especially before the motor vehicle battery is installed in a motor vehicle, the test results can be used as indicators and parameters for the design of the battery module or battery pack of the motor vehicle battery, thereby providing an important basis for the structural design and safety design of the motor vehicle battery, enabling the battery module or battery pack structure to remain intact in the face of extreme battery thermal runaway, avoiding uncontrollable structural damage, and then triggering thermal diffusion and causing greater damage.

[0006] In view of the above considerations of the inventors of the present utility model, an object of the present utility model is to provide a testing device for testing the expansion force of a motor vehicle battery during thermal runaway (mainly for guiding the preliminary conceptual design).

[0007] To achieve the above-mentioned intended purpose, the present utility model provides a testing device for testing battery swelling, the testing device comprising: a first flat plate; a second flat plate arranged parallel to the first flat plate; a third flat plate arranged parallel to the first flat plate and the second flat plate and configured such that the second flat plate is arranged between the first flat plate and the third flat plate; and a plurality of connecting members and a plurality of fastening members; wherein a first space is formed between the first flat plate and the second flat plate for arranging a battery module to be tested; wherein a second space is formed between the second flat plate and the third flat plate for arranging a force sensor; and wherein, in a state where the first flat plate, the second flat plate and the third flat plate are fastened to each other by using the plurality of connecting members and the plurality of fastening members, the second flat plate can freely translate along the plurality of connecting members.

[0008] In some embodiments of the present utility model, a plurality of first through-holes for the connecting members to pass through are provided around the first flat plate, a plurality of second through-holes for the connecting members to pass through are provided around the second flat plate, and the second flat plate is arranged parallel to the first flat plate such that the plurality of second through-holes around the second flat plate are respectively aligned with the plurality of first through-holes around the first flat plate; a plurality of third through-holes for the connecting members to pass through are provided around the third flat plate, the third flat plate is arranged parallel to the first flat plate and the second flat plate and configured such that the second flat plate is arranged between the first flat plate and the third flat plate, such that the plurality of third through-holes around the third flat plate are respectively aligned with the plurality of first through-holes of the first flat plate and the plurality of through-holes around the second flat plate; the plurality of connecting members and the plurality of fastening members include: a plurality of connecting bolts, each connecting bolt having a bolt shank portion, a bolt head radially enlarged at one end of the bolt shank portion, and a threaded end portion at the other end of the bolt shank portion, the plurality of connecting bolts being used to pass through the plurality of first through-holes of the first flat plate, the plurality of second through-holes of the second flat plate and the plurality of third through-holes of the third flat plate which are aligned with each other, thereby connecting the first flat plate, the second flat plate and the third flat plate together; and a plurality of fastening nuts for respectively screwing onto the threaded end portions of the plurality of connecting bolts to fasten the connected first flat plate, second flat plate and third flat plate to each other and be able to apply a pre-tightening force to the plurality of connecting bolts.

[0009] In some embodiments of the present utility model, the outer contours of the first flat plate, the second flat plate and the third flat plate are all rectangular, and the outer contour dimensions of the first flat plate, the second flat plate and the third flat plate are larger than the outer contour dimensions of the battery module to be tested.

[0010] In some embodiments of the present utility model, a heater is provided in the first space.

[0011] In some embodiments of the present utility model, the heater is disposed between the first flat plate and the battery module to be tested, and the heater is a flat plate heater.

[0012] In some embodiments of the present utility model, the heater is a flat plate resistance heater.

[0013] In some other embodiments of the present utility model, the heater is an induction heater, an infrared heater, a dielectric heater, and / or other types of heaters.

[0014] In some embodiments of the present utility model, the test device is further provided with a temperature sensor for measuring the temperature change of the battery module to be tested.

[0015] In some embodiments of the present utility model, the temperature sensor includes a thermocouple and / or a negative temperature coefficient (NTC) thermistor.

[0016] In some embodiments of the present utility model, the first flat plate is provided with at least one acupuncture through hole, and the test device further includes at least one acupuncture needle for piercing through the acupuncture through hole to perform acupuncture damage on the battery module to be tested disposed in the first space, thereby causing thermal runaway of the battery module to be tested.

[0017] In some embodiments of the present utility model, the test device is further provided with a temperature sensor for measuring the temperature change of the battery module to be tested, the temperature sensor includes a thermocouple and / or a negative temperature coefficient (NTC) thermistor, and the temperature sensor is disposed near the acupuncture point.

[0018] In some embodiments of the present utility model, the test device is further provided with an external short - circuit circuit for triggering battery thermal runaway, and the test device is further provided with a temperature sensor for measuring the temperature change of the battery module to be tested, and the temperature sensor includes a thermocouple and / or a negative temperature coefficient (NTC) thermistor.

[0019] In some embodiments of the present utility model, the test device is further provided with buffer materials disposed in the first space and around the battery module to be tested.

[0020] In some embodiments of the present utility model, the buffer material is a buffer pad and / or a heat insulation pad made of a rubber material, an aerogel material, or a microcellular foamed polypropylene (MPP) material.

[0021] In some embodiments of the present utility model, the range of the force sensor is at least 30000N.

[0022] In some embodiments of the present utility model, the force sensor may include a strain tube type force sensor, a diaphragm type force sensor, a strain beam type force sensor, and / or a combined type force sensor.

[0023] Other features and advantages of the subject technology of the present disclosure will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the subject technology of the present disclosure. The advantages of the subject technology of the present disclosure will be realized and obtained by the structure particularly pointed out in the written description, its claims, and the drawings.

[0024] It should be understood that the foregoing general description and the following detailed description are both exemplary and explanatory, and are intended to provide further explanation of the subject technology of the present disclosure claimed. Description of the Drawings

[0025] Many specific details of the present utility model and many other additional beneficial effects can be understood and appreciated from the detailed description in conjunction with the respective drawings. In the drawings:

[0026] Figure 1 is a perspective view of an embodiment of the test device of the present utility model.

[0027] Figure 2 is a front view of an embodiment of the test device of the present utility model.

[0028] Figure 3 is an exploded perspective view of an embodiment of the test device of the present utility model.

[0029] It should be noted that each of the drawings is schematic and not drawn to scale. For example, some small-sized components are enlarged for display, while some large-sized components are appropriately reduced for illustration, so as to clearly and completely express the overall concept of the present utility model and its various details.

[0030] Description of the Drawing Numbers

[0031] 100 Test device

[0032] 10 First flat plate

[0033] 11 First through hole

[0034] 20 Second flat plate

[0035] 21 Second through hole

[0036] 30 Third flat plate

[0037] 31 Third through hole

[0038] 40 Connecting bolt

[0039] 50 Fastening nut

[0040] 60 First space

[0041] 61 Battery module to be tested

[0042] 70 Second space

[0043] 71 Force sensor

[0044] 80 Heater Detailed implementation manner

[0045] The present disclosure will be described below with reference to the accompanying drawings, in which several embodiments of the present disclosure are shown. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present disclosure more complete and fully explain the protection scope of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments.

[0046] It should be understood that in all the drawings, the same reference numerals denote the same elements. In the drawings, for the sake of clarity, the dimensions of some features may be deformed.

[0047] It should be understood that the terms used in the specification are only for describing specific embodiments and are not intended to limit the present disclosure. All terms used in the specification (including technical terms and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of brevity and / or clarity, well-known functions or structures may not be described in detail.

[0048] In the specification, spatial relationship terms such as "upper", "lower", "left", "right", "front", "rear", "high", "low", etc. can illustrate the relationship between one feature and another feature in the drawings. It should be understood that the spatial relationship terms include not only the orientations shown in the drawings but also different orientations during the use or operation of the device. For example, when the device in the drawing is inverted, a feature originally described as "below" other features can now be described as "above" other features. The device can also be oriented in other ways (rotated 90 degrees or in other orientations), and the relative spatial relationship will be correspondingly explained at this time.

[0049] See Figures 1 to 3, the present utility model provides a testing device 100, and the testing device is used for testing battery swelling. In some embodiments of the present utility model, the testing device includes: a first flat plate 10; a second flat plate 20, which is arranged parallel to the first flat plate 10; a third flat plate 30, which is arranged parallel to the first flat plate 10 and the second flat plate 20, and is arranged such that the second flat plate 20 is arranged between the first flat plate 10 and the third flat plate 30; a plurality of connecting members and a plurality of fastening members. In some embodiments of the present utility model, as Figure 1 , Figure 2 and Figure 3 shown, a first space 60 is formed between the first flat plate 10 and the second flat plate 20. In some embodiments of the present utility model, the first space 60 can be used to arrange a battery module 61 to be tested.

[0050] In some embodiments of the present utility model, as Figure 1 , Figure 2 and Figure 3 shown, a second space 70 is formed between the second flat plate 20 and the third flat plate 30, and a force sensor 71 is arranged in the second space 70. The force sensor 71 is used to measure the swelling force generated by the battery module when it is in a working state and / or affected by adverse external conditions (such as abnormal heating) or destructive external conditions (such as puncture damage, etc.).

[0051] In some embodiments of the present utility model, as Figure 1 , Figure 2 and Figure 3 shown, in a state where the first flat plate 10, the second flat plate 20 and the third flat plate 30 are fastened to each other by using the plurality of connecting members and fastening members and a compressive pre-tightening force is applied, the second flat plate 20 can freely translate along the axial direction of the plurality of connecting members.

[0052] As Figure 1 , Figure 2 and Figure 3As shown, in some embodiments of the present invention, a plurality of first through holes 11 for the passage of connecting members are provided around the first flat plate 10, and a plurality of second through holes 21 for the passage of connecting members are provided around the second flat plate 20. The second flat plate 20 is arranged parallel to the first flat plate 10 such that the plurality of second through holes 21 around the second flat plate 20 are respectively aligned with the plurality of through holes 11 around the first flat plate 10. A plurality of third through holes 31 for the passage of connecting members are provided around the third flat plate 30. The third flat plate 30 is arranged parallel to the first flat plate 10 and the second flat plate 20, and is arranged such that the second flat plate 20 is arranged between the first flat plate 10 and the third flat plate 30, so that the plurality of third through holes 31 around the third flat plate 30 are respectively aligned with the plurality of first through holes 11 around the first flat plate 10 and the plurality of second through holes 21 around the second flat plate 20. The plurality of connecting members and the plurality of fastening members include: a plurality of connecting bolts 40, each connecting bolt 40 having a bolt rod portion, a bolt head radially enlarged at one end of the bolt rod portion, and a threaded end portion at the other end of the bolt rod portion. The plurality of connecting bolts 40 are used to pass through the plurality of first through holes 11 of the first flat plate 10, the plurality of second through holes 21 of the second flat plate 20, and the plurality of third through holes 31 of the third flat plate 30 that are aligned with each other, thereby connecting the first flat plate 10, the second flat plate 20, and the third flat plate 30 together. And a plurality of fastening nuts 50, the plurality of fastening nuts 50 are used to be respectively screwed onto the threaded end portions of the plurality of connecting bolts 40, so as to fasten the connected first flat plate 10, second flat plate 20, and third flat plate 30 to each other and be able to apply a compressive pre-tightening force to the plurality of connecting bolts 40.

[0053] The corresponding compressive pre-tightening force can be obtained by adjusting the installation torque of the fastening nut 50. For this purpose, it is necessary to calibrate the relationship between torque and installation force according to the specific technical details / requirements of different batteries and / or different customers.

[0054] In some embodiments of the present invention, such as Figure 3As most clearly shown, the outer contour of the battery module 61 to be tested is a substantially rectangular shape with a certain length and width, and the outer contours of the first flat plate 10, the second flat plate 20, and the third flat plate 30 are all substantially rectangular. The outer contour dimensions of the first flat plate 10, the second flat plate 20, and the third flat plate 30 (i.e., the length and width of each flat plate) are larger than the outer contour dimensions of the battery module 61 to be tested (i.e., the length and width of the battery module 61). This configuration enables connection through-holes to be provided in the edge regions of each flat plate, and enables components / members such as the battery module 61 to be tested and the force sensor 71 to be completely confined within the protection space enclosed by the outer contours of each flat plate, so that components / members such as the battery module 61 to be tested and the force sensor 71 are not interfered with or damaged by other environmental factors.

[0055] In some embodiments of the present invention, the first flat plate 10, the second flat plate 20, and the third flat plate 30 are made of metal.

[0056] In some embodiments of the present invention, the first flat plate 10, the second flat plate 20, and the third flat plate 30 may preferably be made of aluminum plates or steel plates. In some embodiments of the present invention, the first flat plate 10, the second flat plate 20, and the third flat plate 30 may preferably be made of aluminum alloy plates.

[0057] As Figure 3 shown, in some embodiments of the present invention, a heater 80 may be provided in the first space 60.

[0058] As Figure 3 shown, in some embodiments of the present invention, the heater 80 may be disposed between the first flat plate 10 and the battery module 61 to be tested. As Figure 3 shown, in some embodiments of the present invention, the heater 80 is disposed between the first flat plate 10 and the battery module 61 to be tested, and the heater 80 is a flat plate heater. In some embodiments of the present invention, the heater 80 is a flat plate resistance heater. In these embodiments, the heater 80 is provided with a required power supply circuit (not shown) to supply power to the heater 80, so that the heater 80 can heat the battery module 61 to be tested, causing it to thermally expand.

[0059] In some other embodiments not shown in the present invention, the heater 80 may also employ other types of heaters, such as induction heaters, infrared heaters, dielectric heaters, or other types of heaters.

[0060] In some embodiments not shown in the present utility model, the test device 100 is further provided with a temperature sensor for measuring the temperature change of the battery module 61 to be tested.

[0061] In some embodiments not shown in the present utility model, the temperature sensor may include a thermocouple and / or a negative temperature coefficient (NTC) thermistor. In some embodiments not shown in the present utility model, the first plate 10 is provided with at least one acupuncture needle through hole (not shown), and the test device 100 further includes at least one acupuncture needle (not shown), which is used to penetrate through the acupuncture needle through hole to perform acupuncture damage on the battery module 61 to be tested disposed in the first space 60, thereby causing thermal runaway of the battery module to be tested. In these embodiments, the temperature sensor may be disposed near the acupuncture point.

[0062] In some embodiments not shown in the present utility model, the test device 100 is further provided with an external short - circuit circuit for triggering battery thermal runaway.

[0063] In some embodiments not shown in the present utility model, the test device 100 is further provided with a buffer material, which is disposed in the first space 60 and around the battery module 61 to be tested.

[0064] In some embodiments not shown in the present utility model, the buffer material is a buffer pad and / or a heat - insulating pad made of a rubber material, an aerogel material, or a microcellular foamed polypropylene (MPP) material.

[0065] The buffer material can be added as needed. In some embodiments of the present utility model, a rubber pad, a heat - insulating pad, etc. can be selected as the buffer material. In some preferred embodiments of the present utility model, it is preferred to use materials consistent with those used in the actual product to more closely simulate the actual scenario.

[0066] In some embodiments of the present utility model, the range of the force sensor 71 is at least 30000 N, and the force sensor can accurately output the curve of the expansion force of the battery (cell) with respect to time.

[0067] In some embodiments of the present utility model, the force sensor 71 can adopt a strain - tube type force sensor, a diaphragm type force sensor, a strain - beam type force sensor, a combined type force sensor, and / or other types of force sensors.

[0068] The focus of the utility model is to measure the expansion force of the battery (or "battery cell") after thermal runaway. The actual method used to trigger the thermal runaway of the battery or battery cell is not restrictive. In other words, no matter what thermal runaway triggering method is used, as long as it can meet the requirements of GB 38031 (i.e.: Safety requirements for power batteries for electric vehicles).

[0069] In addition, in the present invention, the specific location of the temperature sensor is not restrictive, but can be adjusted and changed according to specific needs. For example, in some embodiments of the present invention, for battery thermal runaway triggered by acupuncture, the temperature sensor can be arranged near the acupuncture point; in other embodiments of the present invention, for battery thermal runaway triggered by heating, the temperature sensor can be arranged on the other side of the battery cell (battery).

[0070] In some embodiments of the present invention, the force sensor 71 is arranged between the second plate and the third plate to accurately measure the expansion force of the battery cell. Regarding the specific structure of each plate 10, 20, 30, except that the acupuncture trigger requires a puncture hole to be reserved on the first plate 10, other triggering methods do not affect the specific structure of the plate.

[0071] In summary, in some aspects, the main points of the solution provided by the present invention can be summarized as follows:

[0072] The test device of the utility model adopts three flat plates to fix the battery and the force sensor, connects the three flat plates together with a plurality of connecting bolts / fastening nuts, and measures the battery expansion force with the force sensor.

[0073] Before conducting a battery expansion force test, the compression force on the battery can be adjusted to a defined value by adjusting the compression preload provided by the fastener relative to the connector to simulate the actual pressure on the battery module or battery pack. The compression force on the battery can also be adjusted to a specific defined value customized for a specific customer based on the needs of the specific customer.

[0074] During the test, the test device of the utility model can use any of the above-mentioned triggering methods of battery thermal runaway (heating pad, needle puncture or external short circuit, etc.) to cause the battery to produce thermal runaway, and use a force sensor to record the relationship curve of the battery expansion force relative to time.

[0075] Optionally, a temperature sensor may be arranged on the test device of the present invention to monitor the temperature.

[0076] Optionally, a buffer material (such as rubber, aerogel, microporous foamed polypropylene, etc.) can be arranged between the battery and the flat plate or between the battery and the heating pad of the test device of the utility model to be closer to the actual use environment.

[0077] Adopting the technical solution provided by the present utility model can at least achieve the following technical effects:

[0078] Using the test device provided by the present utility model enables operators to test the expansion force of a motor vehicle battery, especially the expansion force of a motor vehicle battery before it is installed on a motor vehicle. The test results of the expansion force of the motor vehicle battery can be used as indicators and parameters for the design of a motor vehicle battery module or battery pack, thereby providing an important basis for the structural design and safety design of the motor vehicle battery pack, enabling the battery module or battery pack structure to remain intact even in the face of extreme battery thermal runaway, and avoiding the adverse situation of uncontrollable damage to the battery module or battery pack structure and subsequent thermal diffusion causing greater damage.

[0079] Although the present utility model has been described in detail based on the currently considered most practical and preferred embodiments or aspects, it should be understood that each detail disclosed in the description of the present utility model is illustrative rather than restrictive. The present utility model is not limited to the disclosed embodiments, but should reasonably cover various modifications and equivalent design methods within the creative spirit of the present utility model. For example, it should be understood that to the extent possible, one or more features in any embodiment of the present utility model can be combined with one or more features in any other embodiment to form a new embodiment.

Claims

1. A testing device for testing battery expansion, characterized in that: The testing device comprises: A first plate (10); a second plate (20), the second plate and the first plate being arranged parallel to each other; a third plate (30), the third plate being arranged parallel to the first plate and the second plate, and being arranged such that the second plate is arranged between the first plate and the third plate; and a plurality of connectors and a plurality of fasteners; A first space (60) is formed between the first flat plate and the second flat plate, and the first space is used to arrange a battery module (61) to be tested; Wherein, a heater (80) is provided in the first space (60), and the heater (80) is arranged between the first flat plate (10) and the battery module (61) to be tested; A second space (70) is formed between the second flat plate and the third flat plate, and a force sensor (71) is arranged in the second space for measuring the expansion force of the battery module (61) to be tested; and Wherein, when the first plate, the second plate and the third plate are fastened to each other using the multiple connecting members and the multiple fasteners and a compressive preload is applied by adjusting the installation torque of the multiple fasteners, the second plate can freely translate along the multiple connecting members.

2. The testing device according to claim 1, characterized in that: The periphery of the first plate is provided with a plurality of first through holes for the connecting members to pass through; The second plate is provided with a plurality of second through holes for the connection members to pass through on its periphery, and the second plate and the first plate are arranged parallel to each other so that the plurality of second through holes on the periphery of the second plate are respectively aligned with the plurality of first through holes on the periphery of the first plate; The third plate is provided with a plurality of third through holes for the connection members to pass through on its periphery, and the third plate is arranged parallel to the first plate and the second plate, and is arranged so that the second plate is arranged between the first plate and the third plate, so that the plurality of third through holes on the periphery of the third plate are respectively aligned with the plurality of first through holes on the first plate and the plurality of through holes on the periphery of the second plate; The plurality of connectors and the plurality of fasteners include: a plurality of connecting bolts, each connecting bolt having a bolt shank, a radially enlarged bolt head at one end of the bolt shank, and a threaded end at the other end of the bolt shank, the plurality of connecting bolts being used to pass through a plurality of first through holes aligned with each other in the first plate, a plurality of second through holes in the second plate, and a plurality of third through holes in the third plate, thereby connecting the first plate, the second plate, and the third plate together; and A plurality of fastening nuts are used to be screwed onto the threaded ends of the plurality of connecting bolts respectively, so as to fasten the first plate, the second plate and the third plate connected together to each other and to apply a pre-tightening force to the plurality of connecting bolts.

3. The testing device according to claim 1, characterized in that: The outer contours of the first plate, the second plate and the third plate are all rectangular, and the outer contours of the first plate, the second plate and the third plate are larger than the outer contour of the battery module to be tested.

4. The testing device according to claim 1, characterized in that: The heater is a flat plate heater.

5. The testing device according to claim 4, characterized in that: The heater is a flat-plate resistance heater.

6. The testing device according to claim 1, characterized in that: The heater is an induction heater, an infrared heater and / or a dielectric heater.

7. The testing device according to claim 1, characterized in that: The testing device is also provided with a temperature sensor for measuring the temperature change of the battery module to be tested.

8. The testing device according to claim 7, characterized in that: The temperature sensor includes a thermocouple and / or a negative temperature coefficient thermistor.

9. The testing device according to claim 1, characterized in that: The first plate is provided with at least one puncture needle through hole, and the testing device further comprises at least one puncture needle, which is used to pass through the puncture needle through hole to puncture and damage the battery module to be tested arranged in the first space, thereby causing thermal runaway of the battery module to be tested.

10. The testing device according to claim 9, characterized in that: The testing device is also provided with a temperature sensor for measuring the temperature change of the battery module to be tested. The temperature sensor includes a thermocouple and / or a negative temperature coefficient thermistor. The temperature sensor is arranged near the puncture point.

11. The testing device according to any one of claims 1 to 3, characterized in that: The test device is also provided with an external short circuit for triggering thermal runaway of the battery. The test device is also provided with a temperature sensor for measuring the temperature change of the battery module to be tested. The temperature sensor includes a thermocouple and / or a negative temperature coefficient thermistor.

12. The testing device according to any one of claims 1 to 10, characterized in that: The testing device is further provided with a buffer material, which is disposed in the first space and around the battery module to be tested.

13. The testing device according to claim 12, characterized in that: The buffer material is a buffer pad and / or a heat insulation pad made of rubber material, aerogel material or microporous foamed polypropylene material.

14. The testing device according to any one of claims 1 to 10, characterized in that: The force sensor has a measuring range of at least 30,000 N.

15. The testing device according to any one of claims 1 to 10, characterized in that: The force sensor includes a strain tube force sensor, a diaphragm force sensor, a strain beam force sensor and / or a combined force sensor.

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