Test fixture for thermal diffusion test experiment of battery pack

Abstract

The utility model provides a test fixture for a thermal diffusion test experiment of a battery pack, which comprises a support frame and a pressure plate, and is characterized in that the support frame is used for being detachably connected with the battery pack to be tested; the pressing plate is arranged on one side of the supporting frame in the thickness direction and is used for pressing the surface of a box cover of the battery pack in the thermal diffusion test process of the battery pack. According to the utility model, the problems that in the heat diffusion test process of the battery pack in the prior art, as the internal temperature and the internal air pressure of the battery pack are relatively high, on one hand, the box cover of the battery pack is easily bulged, deformed and even exploded, and on the other hand, the battery pack is not damaged are solved. A bolt for fastening the box cover of the battery pack is easy to loosen, and the operation reliability and the use safety of the new energy automobile cannot be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically, relate to a kind of test fixture for the thermal diffusion test experiment of battery pack. BACKGROUND

[0002] The thermal diffusion test of battery pack is an important test link in new energy automobile industry, mainly through simulating the thermal runaway situation that battery pack can encounter in actual use process, to evaluate the thermal safety performance of battery pack, for new energy automobile, the thermal safety performance of battery pack directly influences the safety and reliability of new energy automobile, therefore, the importance of thermal diffusion experiment of battery pack is self-evident.

[0003] In the process of thermal diffusion test to battery pack, the following phenomena exist universally, namely, after the thermal diffusion phenomenon of battery pack occurs, the internal temperature and internal air pressure of battery pack are relatively high, on the one hand, it is easy to cause the bulging deformation of the lid of battery pack even produce burst phenomenon, on the other hand, it is easy to cause the loosening phenomenon of bolt of battery pack for fastening lid, cannot ensure the operation reliability and use safety of new energy automobile. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a kind of test fixture for the thermal diffusion test experiment of battery pack, to solve the problem in the prior art that, in the process of thermal diffusion test to battery pack, due to the internal temperature and internal air pressure of battery pack are relatively high, on the one hand, it is easy to cause the bulging deformation of the lid of battery pack even produce burst phenomenon, on the other hand, it is easy to cause the loosening phenomenon of bolt of battery pack for fastening lid, cannot ensure the operation reliability and use safety of new energy automobile.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a kind of test fixture for the thermal diffusion test experiment of battery pack, including support frame and pressure plate, wherein, support frame is used to be detachably connected with the battery pack to be tested;Pressure plate is arranged on the thickness direction of one side of support frame, to be used for pressing the surface of the lid of battery pack in the process of thermal diffusion test to battery pack.

[0006] In one exemplary embodiment, pressure plate and support frame are welded connection;Or, pressure plate and support frame are detachably connected.

[0007] In one exemplary embodiment, observation hole is opened on pressure plate, and observation hole is used to observe the thermal runaway position of lid surface.

[0008] In one exemplary embodiment, the aperture range of observation hole is 5mm~20mm.

[0009] In one exemplary embodiment, there are multiple observation holes, which are spaced apart along the length and width directions of the pressure plate.

[0010] In one exemplary embodiment, the cross-section of the observation hole is at least one of a circle, an ellipse, and a polygon.

[0011] In one exemplary embodiment, the observation hole is positioned away from the support frame.

[0012] In one exemplary embodiment, the support frame includes a plurality of first support beams and a plurality of second support beams. The plurality of first support beams are spaced apart along the width direction of the pressure plate. The plurality of second support beams are spaced apart along the length direction of the pressure plate, and each second support beam is connected to the plurality of first support beams to form a grid-shaped support frame. An observation hole is provided on the pressure plate, and the observation hole is located in the hollow area of ​​the support frame.

[0013] In one exemplary embodiment, each hollowed-out area is provided with multiple observation holes, which are arranged in a ring-shaped interval.

[0014] In one exemplary embodiment, the support frame has a mounting post protruding from the edge of the surface on one side of the pressure plate, the mounting post being used to mate with mounting holes on the battery pack.

[0015] In one exemplary embodiment, there are multiple assembly columns, which are spaced apart along the length of the pressure plate; wherein the height of the multiple assembly columns is equal; or, the height of the multiple assembly columns gradually increases along the length of the pressure plate; or, the height of the multiple assembly columns gradually decreases along the length of the pressure plate.

[0016] In one exemplary embodiment, the diameter of the assembly column ranges from 10mm to 20mm; and / or, the assembly columns are distributed on the support frame at equal intervals, with the interval ranging from 100mm to 300mm.

[0017] The present invention provides a test fixture for a thermal diffusion test of a battery pack, comprising a support frame and a pressure plate. The support frame is detachably connected to the battery pack to be tested. The pressure plate is disposed on one side of the support frame in the thickness direction to press the surface of the battery pack cover during the thermal diffusion test.

[0018] By applying pressure to the surface of the battery pack cover using a pressure plate, the bulging, deformation, or even cracking of the cover surface can be prevented as much as possible during the thermal runaway test of the battery pack. This further prevents the bolts used to fasten the cover from loosening, thereby improving the accuracy and reliability of the battery pack test. Attached Figure Description

[0019] The drawings accompanying the specification of this application serve to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A structural schematic view of a test fixture according to an optional embodiment of the present application and a battery pack in an assembled state is shown;

[0021] Figure 2 A structural schematic view of a test fixture in the Figure 1 and a battery pack in a disassembled state is shown.

[0022] Among them, the above drawings include the following reference signs:

[0023] 1, battery pack; 2, assembly hole;

[0024] 10, support frame; 11, first support beam; 12, second support beam; 13, assembly column;

[0025] 20, pressure plate; 21, observation hole. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, and by no means constitutes any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In order to solve the problem that in the prior art, during the heat diffusion test of the battery pack, due to the high internal temperature and internal pressure of the battery pack, on the one hand, the lid of the battery pack is prone to deformation and even explosion, on the other hand, the bolt for fastening the lid of the battery pack is prone to loosening, which cannot ensure the operation reliability and use safety of the new energy automobile, the present application provides a test fixture for heat diffusion test of a battery pack.

[0028] As Figure 1 and Figure 2As shown, the test fixture for the thermal diffusion test experiment of the battery pack includes a support frame 10 and a pressing plate 20, wherein the support frame 10 is used to be detachably connected with the battery pack 1 to be tested; the pressing plate 20 is arranged on one side of the thickness direction of the support frame 10, so as to press the box cover surface of the battery pack 1 during the thermal diffusion test of the battery pack 1.

[0029] By providing the pressing plate 20 with a pressing force for the box cover surface of the battery pack 1, it is possible to prevent the phenomenon of bulging deformation or even explosion of the box cover surface from occurring as much as possible during the thermal runaway test experiment of the battery pack 1, further prevent the loosening phenomenon of the bolt for fastening the box cover of the battery pack 1, and improve the test accuracy and reliability of the battery pack 1.

[0030] It should be noted that in the present application, the pressing plate 20 is welded to the support frame 10. In this way, the connection reliability and stability between the pressing plate 20 and the support frame 10 are ensured.

[0031] Alternatively, the pressing plate 20 and the support frame 10 are connected by laser welding technology, which can provide high-quality welding effect, high connection strength, and no welding slag, thereby ensuring the integrity and stability of the tool structure. In the battery thermal diffusion test, this connection mode can effectively avoid structural failure due to insufficient connection strength, thereby improving the safety of the test.

[0032] Of course, in an embodiment of the present application which is not shown, the pressing plate 20 and the support frame 10 are detachably connected. In this way, the convenience of installation and disassembly between the pressing plate 20 and the support frame 10 is ensured.

[0033] As shown in Figure 1 and Figure 2 , the pressing plate 20 is provided with an observation hole 21 for observing the thermal runaway position of the box cover surface. In this way, the provision of the observation hole 21 ensures that the thermal runaway position of the box cover surface can be observed in real time through the observation hole 21.

[0034] It should be noted that the thermal runaway position of the box cover surface mainly refers to the position of smoke or fire on the box cover surface.

[0035] As shown in Figure 1 and Figure 2 , the observation hole 21 is provided with a plurality of observation holes 21 which are arranged at intervals along the length direction and the width direction of the pressing plate 20. In this way, by providing a plurality of observation holes 21, it is ensured that the observation holes 21 can cover as many positions on the box cover surface as possible, so that the operator can accurately find the specific position of smoke or fire on the box cover surface in time through the observation holes 21, so as to take accurate measures subsequently.

[0036] like Figure 1 As shown, arrow A indicates the width direction of the pressure plate 20, and arrow B indicates the length direction of the pressure plate 20.

[0037] Optionally, the cross-section of the observation hole 21 is at least one of a circle, an ellipse, or a polygon.

[0038] It should be noted that, in this application, to ensure the reliability of the observation hole 21 in observing the specific location of smoke or fire on the surface of the lid, the observation hole 21 is preferably positioned away from the support frame 10. This helps prevent the support frame 10 from obstructing the observation hole 21, thus preventing the timely observation of the smoke or fire location.

[0039] like Figure 1 and Figure 2 As shown, the support frame 10 includes multiple first support beams 11 and multiple second support beams 12. The multiple first support beams 11 are spaced apart along the width direction of the pressure plate 20; the multiple second support beams 12 are spaced apart along the length direction of the pressure plate 20, and each second support beam 12 is connected to multiple first support beams 11 to form a grid-like support frame 10. An observation hole 21 is provided on the pressure plate 20, and the observation hole 21 is located in the hollow area of ​​the support frame 10. This helps to prevent the support frame 10 from blocking the observation hole 21, thus preventing the timely observation of the smoke or fire location.

[0040] Optionally, both the first support beam 11 and the second support beam 12 are square tubes made of aluminum alloy. The lightweight nature of aluminum alloy reduces the overall weight of the tooling, facilitating handling and installation. Simultaneously, its excellent thermal conductivity helps dissipate heat quickly, protecting the tooling from excessive heat. In the laboratory environment of battery pack thermal diffusion testing, this design improves testing flexibility, reduces pre-test preparation time, and is suitable for applications requiring frequent adjustments to the test layout.

[0041] It should be noted that, in one embodiment of this application (not shown), each hollowed-out area is provided with multiple observation holes 21, which are arranged in a ring at intervals. This ensures that as many observation holes 21 as possible can cover the surface of the lid, thereby ensuring the reliability of subsequent observation of the smoke or fire location.

[0042] It should be noted that, in one embodiment of this application (not shown), a heat-insulating material is provided around the observation hole 21. The heat-insulating material effectively prevents heat loss during testing, maintains a stable test environment temperature, and improves test accuracy. In the thermal diffusion test of the battery pack, this design ensures that the temperature around the observation hole 21 does not change significantly due to thermal diffusion, avoiding any impact on the test results. It is suitable for applications requiring precise control of the test environment temperature.

[0043] As shown in Figure 2 The support frame 10 has protruding assembly columns 13 at the surface edges of one side of the pressing plate 20, which are used to cooperate with the assembly holes 2 on the battery pack 1. In this way, the connection reliability between the support frame 10 and the battery pack 1 is ensured, and the disassembly reliability is also ensured.

[0044] Optionally, the diameter of the assembly column 13 is in the range of 10mm-20mm. In this way, the height of the assembly column 13 can be adjusted according to the test requirements. This design can adapt to battery packs of different heights, ensuring that the battery pack cover is uniformly pressed during testing, avoiding test result deviation caused by uneven pressing force. In the test scene of diversified battery pack sizes, the adjustment capability of this equal-height column can meet various test requirements, improving the application range of the tooling.

[0045] Optionally, the material of the assembly column 13 is high-hardness alloy steel, which has excellent wear resistance and compression strength, and can withstand the high-strength pressing force during battery heat diffusion testing, ensuring the stability and durability of the equal-height column. In the heat diffusion test of the battery pack, the selection of this material can effectively prevent the equal-height column from wearing or deforming during long-term use, prolonging the service life of the tooling.

[0046] Further, the distribution of the assembly column 13 on the support frame 10 is equidistantly arranged, with a spacing of 100mm-300mm. This equidistant arrangement can ensure that the surface of the battery pack cover is subjected to uniform pressing force at each point, avoiding excessive local stress and improving the accuracy of the test. In the battery heat diffusion test, this design can effectively prevent the battery pack cover from deforming due to uneven stress, ensuring the reliability of the test results.

[0047] Further, the number and position of the assembly column 13 are optimized according to the size and shape of the battery pack cover. This optimized design can ensure that the equal-height column can achieve the best pressing and limiting effect in the test of battery packs of different sizes and shapes, improving the flexibility and adaptability of the test. In the modern industry with diversified battery pack designs, this tooling can meet the test requirements of different battery packs, providing strong support for the evaluation of battery safety performance.

[0048] Further, the connection between the assembly column 13 and the assembly hole adopts quick fasteners such as buckles or bolts. The use of such quick fasteners makes installation and disassembly more convenient, saves test preparation time, and improves test efficiency. In the rapid iteration process of battery heat diffusion testing, this design can significantly reduce the preparation time before testing, speeding up the test process and being suitable for occasions that require frequent replacement of test samples.

[0049] Optionally, the support frame 10 further comprises reinforcing ribs. The reinforcing ribs can further improve the rigidity and stability of the support frame 10, ensuring that the tooling structure will not deform or fail under high pressure and high temperature test conditions, improving the safety of the test and the reliability of the data. In the battery heat diffusion test, this design can effectively prevent the tooling from structural problems under extreme conditions, ensuring the smooth progress of the test.

[0050] Further, the surface of the support frame 10 is treated with anti-corrosion, such as electroplating or spraying. Anti-corrosion treatment can protect the tooling from corrosive environments, prolong the service life of the tooling, and reduce maintenance costs. In the battery heat diffusion test, this treatment can effectively prevent the tooling from reducing performance due to corrosion during long-term use, and is suitable for test environments where corrosive gases or liquids may exist.

[0051] Optionally, the bottom of the assembly column 13 is provided with an anti-skid pad. The anti-skid pad can increase the friction between the assembly column 13 and the battery pack 1, preventing the assembly column 13 from sliding during the test, and improving the stability of the tooling. In the battery heat diffusion test, this design can effectively avoid the test result deviation caused by the sliding of the assembly column 13, ensuring the accuracy of the test.

[0052] Optionally, the pressure plate 20 is an iron sheet. In this way, it is ensured that the pressure plate 20 can withstand high temperature and high pressure during the heat diffusion test, ensuring the durability and safety of the tooling. In the battery heat diffusion test, the selection of this material can effectively prolong the service life of the tooling, reduce test costs, and is suitable for long-term and frequent test environments.

[0053] It should be noted that in the present application, in order to ensure the reliable pressing of the pressure plate 20 of the test fixture on the surface of the box cover, preferably, the assembly column 13 is a plurality of assembly columns 13, and the plurality of assembly columns 13 are arranged at intervals along the length direction of the pressure plate 20.

[0054] It should be noted that in the present application, when the plurality of assembly holes 2 on the battery pack 1 for one-to-one corresponding cooperation with the plurality of assembly columns 13 are all in the same horizontal plane, optionally, the heights of the plurality of assembly columns 13 are equal. In this way, it is ensured that the pressure plate 20 can be as close as possible to the surface of the box cover.

[0055] It should be noted that, in the present application, when the plurality of assembly holes 2 on the battery pack 1 for one-to-one corresponding cooperation with the plurality of assembly columns 13 are not in the same horizontal plane and are in an inclined state, the surface of the box cover of the battery pack 1 is an inclined surface. In order to ensure that the pressing plate 20 can be as close as possible to the surface of the box cover, preferably, the heights of the plurality of assembly columns 13 are gradually increased along the length direction of the pressing plate 20; or, the heights of the plurality of assembly columns 13 are gradually decreased along the length direction of the pressing plate 20. In this way, the pressing reliability of the pressing plate 20 on the surface of the box cover is ensured.

[0056] Optionally, the aperture range of the observation hole 21 is 5mm-20mm. In this way, both a sufficient observation field of view and a decrease in structural strength due to an excessively large aperture are avoided. In actual tests, this design can ensure the stability of the structure around the observation hole 21, avoid deformation due to pressure changes in the heat diffusion process, and thus ensure the accuracy of test data. The size range of the observation hole 21 is suitable for battery packs 1 of various sizes, whether small mobile phone batteries or large electric vehicle batteries, and the test requirements can be met by adjusting the size of the observation hole 21.

[0057] The present application provides a test fixture for a heat diffusion test experiment of a battery pack, which includes a support frame 10 and a pressing plate 20, wherein the support frame 10 is used to be detachably connected with the battery pack 1 to be tested; and the pressing plate 20 is arranged on one side of the thickness direction of the support frame 10, so as to press the surface of the box cover of the battery pack 1 during the heat diffusion test of the battery pack 1.

[0058] By providing the pressing plate 20 with a pressing force for the surface of the box cover of the battery pack 1, the phenomenon of bulging deformation or even explosion of the surface of the box cover is prevented as much as possible during the heat runaway test experiment of the battery pack 1, and the loosening of the bolts for fastening the box cover of the battery pack 1 is further prevented, thereby improving the test accuracy and reliability of the battery pack 1.

[0059] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0060] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0061] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0062] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0063] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0064] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A test fixture for a thermal propagation test experiment of a battery pack, characterized by, include: A support frame (10) for detachably connecting to the battery pack (1) to be tested; A pressure plate (20) is disposed on one side of the support frame (10) in the thickness direction to press the cover surface of the battery pack (1) during the thermal diffusion test of the battery pack (1).

2. The test fixture according to claim 1, characterized in that, The pressure plate (20) is welded to the support frame (10); or, The pressure plate (20) is detachably connected to the support frame (10).

3. The test fixture of claim 1, wherein, An observation hole (21) is provided on the pressure plate (20), and the observation hole (21) is used to observe the thermal runaway position on the surface of the box cover.

4. The test fixture of claim 3, wherein, The diameter of the observation hole (21) ranges from 5 mm to 20 mm.

5. The test fixture of claim 3, wherein, There are multiple observation holes (21), and the multiple observation holes (21) are spaced apart along the length and width directions of the pressure plate (20).

6. The test fixture of claim 3, wherein, The cross-section of the observation hole (21) is at least one of a circle, an ellipse, or a polygon.

7. The test fixture of claim 3, wherein, The observation hole (21) is positioned away from the support frame (10).

8. The test fixture of claim 1, wherein, The support frame (10) includes: Multiple first support beams (11) are spaced apart along the width direction of the pressure plate (20); Multiple second support beams (12) are spaced apart along the length of the pressure plate (20), and each second support beam (12) is connected to multiple first support beams (11) to form a support frame (10) in the shape of a grid. The pressure plate (20) has an observation hole (21) located in the hollow area of ​​the support frame (10).

9. The test fixture of claim 8, wherein, Each of the hollowed-out areas is provided with a plurality of observation holes (21), which are arranged in a ring-shaped interval.

10. The test fixture of claim 1, wherein, The support frame (10) has a mounting post (13) protruding from the edge of the surface on one side of the pressure plate (20), the mounting post (13) being used to mate with the mounting hole (2) on the battery pack (1).

11. The test fixture according to claim 10, characterized in that, There are multiple assembly columns (13), and the multiple assembly columns (13) are spaced apart along the length direction of the pressure plate (20); wherein, The heights of all the assembly columns (13) are equal; or, The height of the plurality of assembly columns (13) is arranged to gradually increase along the length direction of the pressure plate (20); or, The height of the plurality of assembly columns (13) is arranged to gradually decrease along the length of the pressure plate (20).

12. The test fixture according to claim 10, characterized in that, The diameter of the assembly column (13) ranges from 10mm to 20mm; and / or, The assembly columns (13) are arranged at equal intervals on the support frame (10), and the interval ranges from 100mm to 300mm.

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