A mechanical fatigue life testing device for structural adhesives used in battery packs

Abstract

This utility model discloses a mechanical fatigue life testing device for structural adhesive used in battery packs, comprising a housing, a test sample, an optical signal transmitting / receiving sensor, and a driving mechanism. A slide rail is formed within the housing, and the test sample is slidably disposed within the slide rail, comprising two test sections bonded together by the structural adhesive. The optical signal transmitting / receiving sensor is mounted on the housing and includes an optical signal transmitting end and an optical signal receiving end, with the transmitting and receiving ends symmetrically located on both sides of the bonding point between the two test sections. The driving mechanism is drively connected to the test sample and is used to drive the test sample to reciprocate. This utility model's driving mechanism drives the test sample to reciprocate within the slide rail, successfully simulating the actual working conditions of the test sample under vibration load, and can accurately assess the fatigue life of the structural adhesive under these conditions.

Description

Technical Field

[0001] This utility model relates to the technical field of adhesive testing equipment, and in particular to a mechanical fatigue life testing device for structural adhesives used in battery packs. Background Technology

[0002] In battery pack manufacturing, the performance of structural adhesives has a significant impact on battery pack safety and lifespan. However, current fatigue life testing methods for structural adhesives used in battery packs are scarce, and most adhesive manufacturers only focus on testing basic mechanical parameters such as adhesive bond strength.

[0003] Existing testing equipment has limitations, mostly only able to measure the static tensile and shear strength of adhesives. It cannot simulate the complex dynamic load environments such as vibration and thermal stress faced by adhesives in actual use, making it difficult to assess their true performance under dynamic conditions and posing potential risks to battery pack quality and safety. Furthermore, obtaining adhesive fatigue fracture signals is difficult. Due to the complex characteristics of adhesive materials and the fatigue fracture process, there is currently a lack of reliable technologies to capture this signal in real time and accurately, increasing the difficulty of fatigue testing and making fatigue life assessment results highly uncertain, failing to meet the industry's high-precision testing requirements. Utility Model Content

[0004] In view of the above-mentioned problems of existing testing equipment, this paper aims to provide a mechanical fatigue life testing device for structural adhesives used in battery packs.

[0005] The specific technical solution is as follows:

[0006] A mechanical fatigue life testing device for structural adhesives used in battery packs includes:

[0007] An outer casing, wherein a slide is formed within the outer casing;

[0008] A test specimen, which is slidably disposed within the slide, comprises two test segments bonded together by the structural adhesive;

[0009] An optical signal transmitting and receiving sensor is mounted on a housing and includes an optical signal transmitting end and an optical signal receiving end, with the optical signal transmitting end and the optical signal receiving end symmetrically located on both sides of the bonding point of the two test segments;

[0010] A driving mechanism is connected to the test sample for driving the test sample to slide back and forth.

[0011] As a further improvement and optimization of this solution, the opposite end faces of the two test sections are provided with adhesive portions, and light-shielding portions are provided on both sides of the adhesive portions. When the adhesive portions of the two test sections are bonded to each other, the light-shielding portions of the two test sections are correspondingly sealed and connected.

[0012] As a further improvement and optimization of this solution, the light-shielding part is a foam light-shielding strip provided on the test section. When the adhesive parts of the two test sections are bonded to each other, the foam light-shielding strips of the two test sections contact each other and are compressed and sealed.

[0013] As a further improvement and optimization of this solution, the adhesive part has a circular structure.

[0014] As a further improvement and optimization of this solution, the driving mechanism includes:

[0015] Drive gear;

[0016] Two driven gears are located on both sides of the driving gear and mesh with the driving gear. Each driven gear is rotatably mounted on the test sample via an eccentric shaft, and the eccentric shaft is eccentrically positioned with respect to the driven gear.

[0017] A driving component is connected to the driving gear and is used to drive the driving gear to rotate, thereby driving the two driven gears to rotate, and thus causing the test sample to slide back and forth.

[0018] As a further improvement and optimization of this solution, both the driving gear and each of the driven gears are helical gears.

[0019] As a further improvement and optimization of this solution, the outer shell has two clearance openings that communicate with the slide rail, and the two eccentric shafts pass through the two clearance openings respectively to connect with the test sample.

[0020] As a further improvement and optimization of this solution, the two driven gears are rotatably sleeved on the outside of the two eccentric shafts, and each eccentric shaft is threadedly connected to the test sample.

[0021] As a further improvement and optimization of this solution, the driving component is a motor, and the output shaft of the motor is connected to the drive gear transmission.

[0022] As a further improvement and optimization of this solution, both the test sample and the outer shell are made of aluminum alloy.

[0023] The positive effects of the above technical solution compared with the existing technology are:

[0024] (1) In this utility model, the test sample is driven by a drive mechanism to reciprocate in the slide, which successfully simulates the actual working condition of the test sample under vibration load. It can accurately evaluate the fatigue life of the structural adhesive under this condition, and provides a scientific, reliable and targeted reference for the mechanical performance design of the battery pack. It helps to optimize the structural design of the battery pack and improve its overall performance and reliability.

[0025] (2) In this utility model, by setting up an optical signal receiving and transmitting sensor, when the adhesive layer of the two test sections breaks, the light can pass through the connection and be received by the receiving end. The sensor transmits the signal to the external signal processing system to record the time of adhesive layer breakage. This design can sensitively and accurately capture the critical moment of adhesive layer cracking, providing a reliable basis for accurately evaluating the fatigue life of the adhesive in the battery pack, which helps to deeply understand the performance of the adhesive in actual use, and thus optimize the related design and application of the battery pack. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the mechanical fatigue life testing device for structural adhesive used in battery packs according to this utility model.

[0027] Figure 2 This is a schematic diagram of the test sample of the mechanical fatigue life testing device for structural adhesive used in battery packs according to this utility model;

[0028] Figure 3 This is a schematic diagram of the structure of one test section of the mechanical fatigue life testing device for structural adhesive used in battery packs according to this utility model;

[0029] Figure 4 This is a schematic diagram of another test section of the mechanical fatigue life testing device for structural adhesive used in battery packs according to this utility model.

[0030] In the attached diagram: 1. Housing; 2. Test sample; 3. Optical signal transmitting and receiving sensor; 4. Drive mechanism; 11. Slide rail; 21. Test section; 31. Optical signal transmitting end; 32. Optical signal receiving end; 41. Drive gear; 42. Eccentric shaft; 43. Driven gear; 44. Motor; 45. Bracket; 211. Light-shielding part; 212. Adhesive part. Detailed Implementation

[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Figure 1 This is a schematic diagram of the mechanical fatigue life testing device for structural adhesive used in battery packs according to this utility model. Figure 2 This is a schematic diagram of the test sample of the mechanical fatigue life testing device for structural adhesive used in battery packs according to this utility model. Figure 3 This is a schematic diagram of one test section of a structural fatigue life testing device for structural adhesive used in battery packs according to this utility model. Figure 4 This is a schematic diagram of another test section of the mechanical fatigue life testing device for structural adhesive used in battery packs according to this utility model. Figure 1-4 The diagram illustrates a preferred embodiment of a mechanical fatigue life testing device for structural adhesive used in battery packs. The device includes a housing 1, a test sample 2, an optical signal transmitting / receiving sensor 3, and a driving mechanism 4. A slide rail 11 is formed within the housing 1. The test sample 2 is slidably disposed within the slide rail 11 and includes two test sections 21 bonded together by structural adhesive. The optical signal transmitting / receiving sensor 3 is mounted on the housing 1 and includes an optical signal transmitting end 31 and an optical signal receiving end 32. The optical signal transmitting end 31 and the optical signal receiving end 32 are symmetrically located on both sides of the bonding point between the two test sections 21. The driving mechanism 4 is connected to the test sample 2 via a transmission mechanism and is used to drive the test sample 2 to reciprocate.

[0035] In this embodiment, the driving mechanism 4 drives the test sample 2 to reciprocate within the slide 11, successfully simulating the actual working conditions of the test sample 2 under vibration load. This allows for accurate evaluation of the fatigue life of the structural adhesive under these conditions, providing a scientific, reliable, and targeted reference for the mechanical performance design of the battery pack. This helps to optimize the battery pack structure design and improve its overall performance and reliability.

[0036] In this embodiment, by setting up an optical signal receiving and transmitting sensor 3, when the adhesive layer of the two test sections 21 breaks, the light can pass through the connection and be received by the receiving end. The sensor transmits the signal to an external signal processing system (computer) to record the time of adhesive layer breakage. This design can sensitively and accurately capture the critical moment of adhesive layer cracking, providing a reliable basis for accurately evaluating the fatigue life of the adhesive in the battery pack. It helps to deeply understand the performance of the adhesive in actual use, and thus optimize the related design and application of the battery pack.

[0037] Even better, the outer shell 1 on both sides of the connection between the two test sections 21 is provided with a detection port that communicates with the slide 11, and the optical signal transmitter 31 and the optical signal receiver 32 are respectively installed at the two detection ports.

[0038] Specifically, in this embodiment, the optical signal receiving and transmitting sensor 3 is an existing mature component, and its specific structure and principle will not be described in detail here.

[0039] Furthermore, as a preferred embodiment, each of the two test segments 21 has an adhesive portion 212 on its opposite end face, and a light-shielding portion 211 is provided on both sides of the adhesive portion 212. When the adhesive portions 212 of the two test segments 21 are bonded together, the light-shielding portions 211 of the two test segments 21 are correspondingly sealed and connected. In this embodiment, by providing light-shielding portions 211 on both sides of the adhesive portion 212, the light signal is prevented from being transmitted from the non-adhesive area of ​​the two test segments 21 to the light signal receiving end 32, thereby improving the test accuracy.

[0040] Furthermore, as a preferred embodiment, the light-shielding part 211 is a foam light-shielding strip disposed on the test section 21. When the adhesive parts 212 of the two test sections 21 are bonded together, the foam light-shielding strips of the two test sections 21 contact each other and are compressed and sealed. In this embodiment, the light-shielding part 211 is a foam light-shielding strip. After the adhesive parts 212 on the two test sections 21 are bonded together with structural adhesive, the foam light-shielding strips on the two test sections 21 are squeezed and compressed to form a light seal, which improves the light-shielding effect and further improves the test accuracy.

[0041] Furthermore, as a preferred embodiment, the adhesive portion 212 has a circular structure. In some other embodiments, the adhesive portion 212 may also have other shapes, such as square or rectangular.

[0042] Furthermore, in a preferred embodiment, the drive mechanism 4 includes a drive gear 41, two driven gears 43, and a drive member. The two driven gears 43 are located on both sides of the drive gear 41 and mesh with it. Each driven gear 43 is rotatably mounted on the test sample 2 via an eccentric shaft 42, and the eccentric shaft 42 is eccentrically positioned with respect to the driven gear 43. The drive member is connected to the drive gear 41 for driving the drive gear 41 to rotate, thereby driving the two driven gears 43 to rotate, and thus causing the test sample 2 to slide back and forth. In this embodiment, the test sample 2 is driven to reciprocate through a gear structure to transmit vibration load. The load transmission is smooth and reliable. At the same time, the driving speed of the drive gear 41 can be adjusted to adjust the vibration frequency, which is suitable for testing the life of adhesive structures at different vibration frequencies.

[0043] More specifically, both eccentric shafts 42 are mounted on the same test section 21.

[0044] Of course, in another embodiment, the drive mechanism 4 can also be a linear drive such as an electric cylinder, a pneumatic cylinder, or a hydraulic cylinder.

[0045] Furthermore, as a preferred embodiment, the driving gear 41 and each driven gear 43 are helical gears, which have higher power transmission stability. Of course, in some embodiments, the driving gear 41 and the driven gear 43 may also be spur gears.

[0046] Furthermore, as a preferred embodiment, the outer shell 1 has two clearance openings that communicate with the slide rail 11. The two eccentric shafts 42 pass through the two clearance openings respectively and are connected to the test sample 2. The clearance openings are provided to prevent spatial interference when the eccentric shafts 42 drive the test sample 2 to slide back and forth.

[0047] Furthermore, as a preferred embodiment, the two driven gears 43 are rotatably sleeved on the outside of the two eccentric shafts 42, and each eccentric shaft 42 is threadedly connected to the test sample 2. The eccentric shaft 42 and the test sample 2 are threadedly connected, which is detachable and convenient for assembly and disassembly.

[0048] Furthermore, as a preferred embodiment, the driving component is a motor 44, and the output shaft of the motor 44 is connected to the drive gear 41 for transmission. More preferably, the housing 1 is fixed on the test bench, and the motor 44 can also be fixed on the test bench by the bracket 45.

[0049] Furthermore, as a preferred embodiment, both the test sample 2 and the outer casing 1 are made of aluminum alloy. In some embodiments, the test sample 2 may also be made of other materials, such as plastic.

[0050] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for testing the mechanical fatigue life of structural adhesive for battery packs, characterized in that, include: An outer casing, wherein a slide is formed within the outer casing; A test specimen, which is slidably disposed within the slide, comprises two test segments bonded together by the structural adhesive; An optical signal transmitting and receiving sensor is mounted on a housing and includes an optical signal transmitting end and an optical signal receiving end, with the optical signal transmitting end and the optical signal receiving end symmetrically located on both sides of the bonding point of the two test segments; A driving mechanism is connected to the test sample for driving the test sample to slide back and forth.

2. The mechanical fatigue life testing device for structural adhesive used in battery packs according to claim 1, characterized in that, Both test sections have adhesive portions on their opposite end faces, and light-shielding portions are provided on both sides of the adhesive portions. When the adhesive portions of the two test sections are bonded together, the light-shielding portions of the two test sections are correspondingly sealed and connected.

3. The mechanical fatigue life testing device for structural adhesive used in battery packs according to claim 2, characterized in that, The light-shielding part is a foam light-shielding strip provided on the test section. When the adhesive parts of the two test sections are bonded to each other, the foam light-shielding strips of the two test sections contact each other and are compressed and sealed.

4. The mechanical fatigue life testing device for structural adhesive used in battery packs according to claim 2, characterized in that, The adhesive portion has a circular structure.

5. The mechanical fatigue life testing device for structural adhesive used in battery packs according to claim 1, characterized in that, The drive mechanism includes: Drive gear; Two driven gears are located on both sides of the driving gear and mesh with the driving gear. Each driven gear is rotatably mounted on the test sample via an eccentric shaft, and the eccentric shaft is eccentrically positioned with respect to the driven gear. A driving component is connected to the driving gear and is used to drive the driving gear to rotate, thereby driving the two driven gears to rotate, and thus causing the test sample to slide back and forth.

6. The mechanical fatigue life testing device for structural adhesive used in battery packs according to claim 5, characterized in that, Both the driving gear and each of the driven gears are helical gears.

7. The mechanical fatigue life testing device for structural adhesive used in battery packs according to claim 5, characterized in that, The outer shell has two clearance openings that communicate with the slide rail, and the two eccentric shafts pass through the two clearance openings respectively and are connected to the test sample.

8. The mechanical fatigue life testing device for structural adhesive used in battery packs according to claim 7, characterized in that, The two driven gears are rotatably mounted on the outside of the two eccentric shafts, and each eccentric shaft is threadedly connected to the test sample.

9. The mechanical fatigue life testing device for structural adhesive used in battery packs according to claim 5, characterized in that, The driving component is a motor, and the output shaft of the motor is connected to the drive gear.

10. The mechanical fatigue life testing device for structural adhesive used in battery packs according to claim 1, characterized in that, Both the test sample and the outer shell are made of aluminum alloy.

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