Sealing test tool and sealing test system for new energy automobile floor assembly

Abstract

The utility model provides a sealing test tool and a sealing test system for a floor assembly of a new energy automobile. A lower automobile body simulation assembly is used for simulating the floor assembly of the new energy automobile. The battery upper cover simulation assembly is used for simulating a battery upper cover of a new energy automobile, and the two are in sealed connection through the sealing assembly. And the plurality of side plates are respectively arranged at the periphery of the base plate, and are respectively lapped and fixed at the corresponding side edges of the base plate, so that the lap joint structure of the metal plate of the lower vehicle body is simulated. The battery upper cover simulation assembly is arranged to be of a structure matched with the base plate, is fixedly connected to the side, where the notch of the groove is located, of the base plate, at least covers the side plates, and can simulate the lap joint structure of the metal plate and the battery upper cover. When the sealing test tool is used, water is injected into the groove through the water injection opening in the base plate, and whether water leaks or not is observed, so that the sealing performance is tested. When the sealing test tool is used for the sealing test of the automobile floor, the structure of the automobile floor can be more comprehensively simulated.

Description

Technical Field

[0001] This utility model belongs to the field of sealing test technology, and specifically relates to a sealing test fixture and a sealing test system for a new energy vehicle floor assembly. Background Technology

[0002] Currently, the new energy vehicle industry uses Cell to Body (CTB) technology to integrate the vehicle floor (lower body) and the battery cover into one, replacing part of the vehicle floor structure with the battery pack cover. Due to the complexity of the vehicle floor structure, sheet metal is usually welded together to form the vehicle floor. Actual verification has shown that the sheet metal overlapping structure can cause water leakage in the CTB structure. The presence of water leakage indicates that the CTB structure has poor sealing performance.

[0003] In the prior art, the tooling for testing the sealing performance of the sealing structure of the new energy vehicle floor assembly uses a flat plate as a cover to simulate the side of the new energy vehicle floor assembly. As mentioned earlier, the structure of the side of the new energy vehicle floor assembly is not actually a flat plate structure, but a structure in which multiple sheet metal pieces are overlapped together. Therefore, the existing sealing test tooling for the new energy vehicle floor assembly does not simulate the sheet metal overlap structure based on the actual side structure of the vehicle body, and cannot test the sealing performance of the sheet metal overlap structure. Utility Model Content

[0004] The purpose of this invention is to solve the problem that the existing CTB sealing test fixture does not simulate the sheet metal overlap structure based on the actual automotive body side structure (floor assembly), and therefore cannot test the sealing performance of the sheet metal overlap structure.

[0005] To address the aforementioned technical problems, this utility model discloses a sealing test fixture for a new energy vehicle floor assembly, comprising a lower body simulation component, a battery top cover simulation component, and a sealing component sealingly connected between the lower body simulation component and the battery top cover simulation component. The lower body simulation component includes a base plate and multiple side plates. The center portion of the base plate has a groove recessed from its top to its bottom. The multiple side plates are respectively disposed around the base plate and overlap and are fixed to the corresponding side edges of the base plate. The battery top cover simulation component is configured to fit the base plate and is fixedly connected to the side of the base plate where the groove opening is located, and at least covers the multiple side plates. The sealing component extends circumferentially along the base plate and is clamped between the base plate and the battery top cover simulation component, with at least a portion of the sealing component extending between the multiple side plates and the battery top cover simulation component. Furthermore, the base plate is provided with a water inlet communicating with the inside and outside of the groove.

[0006] Using the above technical solution, the lower body simulation component is used to simulate the floor assembly of a new energy vehicle, i.e., the lower body; the battery cover simulation component is used to simulate the battery cover of a new energy vehicle, and the two are sealed together by a sealing component. When the lower body simulation component and the battery cover simulation component are sealed together, the groove formed in the center of the substrate from its top to its bottom is closed by the battery cover simulation component to form a cavity. When testing the sealing performance using this sealing test fixture, water is injected into the groove through the water injection port on the substrate, and the sealing test fixture is observed to test whether there is any leakage, thus testing the sealing performance. Since the sheet metal overlapping structure of the new energy vehicle floor assembly is not a structure where the sheet metal is completely overlapped, but rather the upper and lower sheet metal parts overlap, multiple side plates are respectively set around the substrate, and respectively overlapped and fixed to the corresponding side edges of the substrate, thereby simulating the overlapping structure of the lower body sheet metal. Specifically, the battery cover simulation assembly is configured to fit the substrate and is fixedly connected to the side of the groove on the substrate. It covers at least multiple side plates, meaning the side plates are positioned between the substrate and the battery cover simulation assembly, forming a structure where the substrate, side plates, and battery cover simulation assembly are sequentially connected. This simulates the overlap structure and connection method between the vehicle body sheet metal and the battery cover. A sealing assembly extends circumferentially along the substrate and is clamped between the substrate and the battery cover simulation assembly, sealing the contact area between them. The sealing assembly extends to the portion between the multiple side plates and the battery cover simulation assembly to seal the substrate and the corresponding side plates.

[0007] Therefore, using the sealing test fixture provided by this utility model to conduct sealing tests on automotive flooring can more comprehensively simulate the sheet metal overlap structure of automotive flooring, resulting in better sealing performance of the sheet metal overlap structure and improving the accuracy of test data.

[0008] According to another specific embodiment of the present invention, the sealing test fixture for the new energy vehicle floor assembly disclosed in this embodiment of the present invention has flanges and recesses formed on the outer edges of opposite sides of the substrate. The flanges protrude from the corresponding side plates, and the side plates protrude from the recesses. One of the other two sides of the substrate protrudes from the corresponding side plate, and the other side is closer to the center of the substrate than the corresponding side plate.

[0009] Using the above technical solution, since the sheet metal overlap structure of the new energy vehicle floor assembly is not a structure where the sheet metal is completely overlapped, but rather where the upper and lower sheet metal parts overlap and have relatively protruding parts, and the relatively protruding parts are used to connect with other body structures, the structure of the base plate flange protruding from its corresponding side plate, the side plate protruding from its corresponding base plate recess, one side of the base plate protruding from its corresponding side plate, and the other side of the side plate protruding from the base plate is used to simulate the sheet metal overlap structure of the floor assembly. The parts of the base plate and the side plate that protrude from the other are used to connect with other structural parts of the body.

[0010] According to another specific embodiment of the present invention, the sealing test fixture for the floor assembly of a new energy vehicle disclosed in this embodiment of the present invention includes a first sealing member and a second sealing member. The first sealing member extends circumferentially along the substrate and is clamped between the substrate, multiple side plates and the battery cover simulation assembly. The second sealing member is clamped between the substrate and multiple side plates and extends along the length direction of the side plates.

[0011] Using the above technical solution, since there are gaps between the lower body and the battery cover of the integrated battery body structure of new energy vehicles during installation, water leakage is likely to occur when the vehicle is wading through water. Sealing foam, sealing rubber, and other sealing components are required. Therefore, a first sealing component is used to seal the base plate, multiple side plates, and the battery cover, simulating the sealing structure of the integrated battery body structure of new energy vehicles that seals the lower body and the battery cover. Furthermore, since the sheet metal overlap structure of the lower body consists of at least partially overlapping sheet metal directly connected to each other, gaps exist during assembly, requiring sealing adhesive, sealing strips, etc. Therefore, a second sealing component is sandwiched between the base plate and multiple side plates, simulating the sealing adhesive or sealing strip of the sheet metal overlap structure.

[0012] According to another specific embodiment of the present invention, the sealing test fixture for the new energy vehicle floor assembly disclosed in this embodiment of the present invention includes a first sealing element comprising a plurality of sealing rings stacked together, the sealing rings extending circumferentially along the substrate.

[0013] Using the above technical solution, the sealing ring extends circumferentially along the substrate to adapt to the structure of the connection between the substrate and the battery cover, simulating the assembly, thus achieving a seal. Different compression levels of the sealing foam can be simulated by adjusting the number of sealing rings.

[0014] According to another specific embodiment of the present invention, the sealing test fixture for the new energy vehicle floor assembly disclosed in this embodiment of the present invention further includes a third sealing element. Both ends of each side plate and one side near the corresponding substrate side edge are sealed to the substrate through the third sealing element.

[0015] Using the above technical solution, since the overlapping sheet metal at the edges of the lower body sheet metal are not on the same horizontal plane, it is necessary to fill the gap with sealant or sealing strips to make the joint of the sheet metal overlap smoother. Therefore, the connection between the two ends of the side plate and the base plate, as well as the connection between the side plate and the side edge of the base plate, are sealed by the third sealing element to simulate the sealing structure of the sheet metal overlap joint.

[0016] According to another specific embodiment of the present invention, the sealing test fixture for the new energy vehicle floor assembly disclosed in this embodiment of the present invention has a plurality of point-shaped connection parts evenly arranged along the length direction of the side plate between the surface corresponding to the substrate and each side plate.

[0017] Using the above technical solution, in the sheet metal overlapping structure of the lower body, since the sheet metal is a plate-shaped structure, the overlapping area of ​​the corresponding surfaces is large. Therefore, multiple point-shaped connecting parts are set between the surfaces corresponding to each side plate and the base plate, which are evenly arranged along the length of the side plate, so that the connection between each side plate and the base plate is more solid.

[0018] According to another specific embodiment of the present invention, the sealing test fixture for the new energy vehicle floor assembly disclosed in this embodiment of the present invention has a limiting part that is adapted to the shape of the first sealing element on the side where the battery cover simulates the component and the first sealing element are connected.

[0019] By adopting the above technical solution, a limiting part adapted to the shape of the first seal is formed on the side where the battery cover simulation component is connected to the first seal. This makes it easier to find the target installation position of the first seal relative to the battery cover simulation component when installing the first seal, based on the shape of the limiting part. This ensures that the first seal corresponds and fits the battery cover simulation component, avoiding gaps. At the same time, since the battery cover simulation component is designed to fit the substrate, the first seal also fits the substrate. That is, the limiting part allows the first seal to be fitted and installed between the substrate and the battery cover simulation component, thereby improving the sealing performance between the substrate and the battery cover simulation component.

[0020] According to another specific embodiment of the present invention, the sealing test fixture for the floor assembly of a new energy vehicle disclosed in this embodiment of the present invention has a battery cover simulation component made of transparent material.

[0021] Using the above technical solution, the battery cover simulation component made of transparent material allows for easy observation of water leakage inside the sealing test fixture from the side where the battery cover simulation component is located during testing after the sealing test fixture is assembled.

[0022] The present invention also discloses a sealing test system for a new energy vehicle floor assembly, comprising: a water injection device and a plurality of test fixtures as described above connected to the water injection device; wherein the water outlet of the water injection device is connected to the water injection port pipe on the substrate of at least one of the plurality of test fixtures.

[0023] Using the above technical solution, water is injected into the water inlet on the substrate of the test fixture through a water injection device. The sealing performance of the test fixture is detected by observing whether the test fixture leaks water, which facilitates the inspection of the sealing performance of the battery body integrated structure.

[0024] According to another specific embodiment of the present invention, the sealing test system for the floor assembly of a new energy vehicle disclosed in this embodiment includes a water injection device comprising a water tank, a connecting pipe, and a multi-way valve; wherein the water tank is provided with a water injection mark; the connecting pipe is disposed between the water outlet of the water tank and the water injection ports of multiple test fixtures; the multi-way valve is disposed in the connecting pipe, and the water outlet of the water tank is selectively connected to the water injection port pipeline on the substrate of at least one of the multiple test fixtures through the multi-way valve.

[0025] The water injection device using the above technical solution includes a water tank, a connecting pipe, and a multi-way valve. The connecting pipe connects the water tank outlet to the water injection ports of multiple test fixtures. The multi-way valve connects to the water injection ports on the substrates of multiple test fixtures, and by controlling the opening and closing of the multi-way valve, water can be selectively injected into the corresponding water injection port on the substrate of the test fixture. The water injection volume can be controlled by the water injection markings on the water tank, thereby controlling the water injection pressure in the test fixtures.

[0026] The beneficial effects of this utility model are as follows:

[0027] The sealing test fixture for the new energy vehicle floor assembly provided by this utility model uses a lower body simulation component to simulate the floor assembly of a new energy vehicle, i.e., the lower body; and a battery cover simulation component to simulate the battery cover of a new energy vehicle, and the two are sealed together by a sealing component. When the lower body simulation component and the battery cover simulation component are sealed together, the groove formed in the center of the substrate from its top to its bottom is closed by the battery cover simulation component, thus forming a cavity. When testing the sealing performance using this sealing test fixture, water is injected into the groove through the water injection port on the substrate, and the sealing test fixture is observed to test whether there is any leakage. Since the sheet metal overlapping structure of the new energy vehicle floor assembly is not a structure where the sheet metal is completely overlapped, but rather the upper and lower sheet metal parts overlap, multiple side plates are respectively set around the substrate, and respectively overlapped and fixed to the corresponding side edges of the substrate, thereby simulating the overlapping structure of the lower body sheet metal. Specifically, the battery cover simulation assembly is configured to fit the substrate and is fixedly connected to the side of the groove on the substrate. It covers at least multiple side plates, meaning the side plates are positioned between the substrate and the battery cover simulation assembly, forming a structure where the substrate, side plates, and battery cover simulation assembly are sequentially connected. This simulates the overlap structure and connection method between the vehicle body sheet metal and the battery cover. A sealing assembly extends circumferentially along the substrate and is clamped between the substrate and the battery cover simulation assembly, sealing the contact area between them. The sealing assembly extends to the portion between the multiple side plates and the battery cover simulation assembly to seal the substrate and the corresponding side plates.

[0028] Furthermore, the pipelines of the aforementioned multiple sealing test fixtures are connected to the sealing test system. Water is injected into the water inlets on the substrates of the multiple sealing test fixtures through the water injection device of the sealing test system, and the sealing test fixtures are observed to test whether they leak water, thereby testing their sealing performance.

[0029] Therefore, using the sealing test fixture provided by this utility model to conduct sealing tests on automotive flooring can more comprehensively simulate the sheet metal overlap structure of automotive flooring, resulting in better sealing performance of the sheet metal overlap structure and improving the accuracy of test data. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the sheet metal overlap structure of the lower body of a new energy vehicle and the resulting joint structure in the existing technology.

[0031] Figure 2 A partial side view of a preferred embodiment of the present invention is shown in the prior art of a new energy vehicle's lower body sheet metal overlap structure.

[0032] Figure 3 A top view of the sealing test fixture for the new energy vehicle floor assembly provided in Embodiment 1 of this utility model;

[0033] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0034] Figure 5 for Figure 4 A magnified view of part B in the middle section;

[0035] Figure 6 A bottom view of the undercarriage simulation component of the sealing test fixture for the new energy vehicle floor assembly provided in Embodiment 1 of this utility model (excluding the sealing component);

[0036] Figure 7 Another bottom view of the lower body simulation component of the sealing test fixture for the new energy vehicle floor assembly provided in Embodiment 1 of this utility model;

[0037] Figure 8 for Figure 7 Sectional view along the CC direction;

[0038] Figure 9 A schematic diagram of the battery cover simulation component of the sealing test fixture for the new energy vehicle floor assembly provided in Embodiment 1 of this utility model;

[0039] Figure 10 A schematic diagram of the first sealing element of the sealing test fixture for the new energy vehicle floor assembly provided in Embodiment 1 of this utility model;

[0040] Figure 11 A schematic diagram of the assembly process of the sealing test fixture for the new energy vehicle floor assembly provided in Embodiment 1 of this utility model;

[0041] Figure 12 A schematic diagram of a sealing test system for a new energy vehicle floor assembly provided in Embodiment 2 of this utility model.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Sealing test fixture; 10. Lower body simulation assembly; 100. Base plate; 1001. Groove; 1002. Water inlet; 1003. Flange; 1004. Recess; 101. Side plate; 11. Sealing assembly; 110. First seal; 111. Second seal; 112. Third seal; 113. Point connection; 12. Battery top cover simulation assembly; 120. Limiting part;

[0044] 2. Water injection device; 20. Water tank; 200. Water injection mark; 21. Connecting pipe; 22. Multi-way valve;

[0045] Y, the length direction of the side plate. Detailed Implementation

[0046] Cell-to-Body (CTB) technology is a new trend in the development of the new energy vehicle industry in recent years, and an increasing number of models are adopting this technology. CTB integrates the vehicle floor assembly (lower body) and the battery cover into one unit, replacing part of the vehicle floor assembly structure with the battery cover. The battery cover connects to the lower body to seal the vehicle body. Sealing is one of the challenges of CTB technology, especially for welded vehicle floors. Figure 1 As shown, due to the overlapping of sheet metal, there will be overlapping seams at the sealing surface of the vehicle body. After actual verification, the overlapping seam of sheet metal is a high-risk area for water leakage in the CTB structure. The presence of water leakage indicates that the CTB structure has poor sealing performance.

[0047] Existing fixtures for testing the sealing performance of new energy vehicle floor assemblies are typically designed for the sealing surface between the lower body and the battery cover. They are used to test the sealing performance at this surface, employing a flat plate as the cover to simulate the vehicle body side of the floor assembly. However, as mentioned earlier, the actual structure of the vehicle body side of the new energy vehicle floor assembly is not a flat plate but rather a structure of sheet metal overlapping. Therefore, existing sealing test fixtures for new energy vehicle floor assemblies do not simulate the sheet metal overlapping structure based on the actual vehicle body side structure, and thus cannot test the sealing performance of this overlapping structure. Verifying the sealing performance of the sheet metal overlapping structure using a real vehicle is costly and time-consuming, failing to meet the rapid development needs of current projects. Furthermore, if subsequent verification results fail to meet requirements, a new mold needs to be created for verification, further contributing to the high cost and long testing time of the sheet metal overlapping structure sealing performance test.

[0048] To address the problem mentioned above that the existing CTB sealing test fixture does not simulate the sheet metal overlap structure based on the actual automotive body side structure (floor assembly), thus failing to test the sealing performance of the sheet metal overlap structure, this utility model provides a sealing test fixture and a sealing test system for a new energy vehicle floor assembly. This system simulates the sealing performance of the sheet metal overlap structure through the overlap between the base plate and the side plate. Figure 1 The lower body sheet metal overlap structure shown is used to test the sealing performance of the sheet metal overlap structure using a sealing test fixture.

[0049] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0050] like Figure 2The diagram shows a standard sheet metal overlap for the lower body. The upper sheet metal is stamped towards the lower sheet metal, ensuring the upper edge of the upper sheet metal has rounded corners and the stamping burrs face downwards. The distance from the center of the weld point to the edge of the joint is at least 10mm to prevent weld burrs from affecting adhesive application. The distance from the edge of the lower sheet metal to the rounded corner of the upper sheet metal is at least 3mm. The preferred embodiment of this invention is as follows: Figure 2 The lower body sheet metal overlap structure shown is simulated by the base plate 100 and side plate 101 of the lower body simulation assembly 10 of the sealing test fixture 1. Figure 2 The sheet metal overlap structure shown.

[0051] Example 1

[0052] First, the sealing test fixture 1 for this new energy vehicle floor assembly will be described in general.

[0053] like Figure 3 As shown, a specific embodiment of this utility model provides a sealing test fixture 1 for a new energy vehicle floor assembly, including a lower body simulation component 10, a battery cover simulation component 12, and a sealing component 11 sealingly connected between the lower body simulation component 10 and the battery cover simulation component 12. After the lower body simulation component 10, the sealing component 11, and the battery cover simulation component 12 are sequentially installed and connected, water is injected into the sealing test fixture 1 under pressure, and the leakage of the fixture is observed, such as the leakage point or the leakage amount, thereby testing the sealing performance of the sealing fixture. The lower body simulation component 10 is used to simulate the floor assembly of a new energy vehicle, i.e., the lower body; the battery cover simulation component 12 is used to simulate the battery cover of a new energy vehicle. Therefore, by testing the sealing performance of the sealing test fixture 1, the sealing performance of the integrated battery structure of the new energy vehicle body can be simulated and tested. Compared with actual vehicle verification, this solution does not require the development of a proportional soft prototype vehicle and battery pack, which can save mold costs, test equipment, and site usage costs.

[0054] Specifically, such as Figure 3 , Figure 6 and Figure 7 As shown, the lower body simulation assembly 10 includes a base plate 100 and multiple side plates 101. When the lower body simulation assembly 10 is sealed to the battery cover simulation assembly 12, the groove 1001 formed in the center of the base plate 100, which is recessed from its top to its bottom, is closed by the battery cover simulation assembly 12, thus forming a cavity. Water is injected into the groove 1001 through the water inlet 1002 on the base plate 100, and the sealing test fixture 1 is observed to test whether there is any leakage, thereby testing the sealing performance.

[0055] It is understandable that the number of side plates 101 can be set to 4, 8, 12 or more, and they can be arranged around the base plate 100 to simulate a sheet metal overlapping structure. For ease of understanding, as follows: Figure 3, Figure 6 and Figure 7 As shown, this embodiment preferably uses four side plates.

[0056] It should be noted that the top of the substrate 100 refers to the side closer to the battery cover simulation component 12, and the bottom of the substrate 100 refers to the side farther away from the battery cover simulation component 12.

[0057] Because the sheet metal overlap structure of the floor assembly of new energy vehicles is not a structure where the sheet metal completely overlaps, but rather... Figure 2 The sheet metal parts arranged vertically overlap, so by setting multiple side plates 101 around the base plate 100 respectively, and overlapping and fixing them to the corresponding side edges of the base plate 100, the overlapping structure of the lower body sheet metal is simulated.

[0058] The battery cover simulation component 12 is configured to be adapted to the substrate 100 and is fixedly connected to the side of the groove 1001 on the substrate 100. It covers at least a plurality of side plates 101, that is, the side plates 101 are arranged between the substrate 100 and the battery cover simulation component 12, forming a structure in which the substrate 100, the side plates 101 and the battery cover simulation component 12 are connected in sequence, thereby simulating the overlap structure and connection method of the body sheet metal and the battery cover.

[0059] The sealing component 11 extends circumferentially along the substrate 100 and is sandwiched between the substrate 100 and the battery cover simulation component 12, thereby sealing the contact area between the substrate 100 and the battery cover simulation component 12. The sealing component 11 sandwiched between the substrate 100 and the battery cover simulation component 12 is used to simulate the sealing foam, sealant, rubber seals, etc., of the integrated battery structure of the vehicle body. At least a portion of the sealing component 11 extends between the plurality of side plates 101 and the battery cover simulation component 12, thereby sealing the corresponding surfaces where the substrate 100 and the corresponding side plates 101 are connected. The sealing component 11 extending between the plurality of side plates 101 and the battery cover simulation component 12 is used to simulate the sealing adhesive, sealing rubber, etc., at the overlapping parts of the sheet metal joint structure of the lower body.

[0060] In summary, the sealing test fixture 1 provided in the above-described specific embodiments of this utility model simulates, through the overlapping of the base plate 100 and the side plate 101, the sealing test fixture 1. Figure 1 The lower body sheet metal overlap structure shown is used to test the sealing performance of the sheet metal overlap structure through sealing test fixture 1. This can more comprehensively simulate the sheet metal overlap structure of a car floor, resulting in better sealing performance testing and improving the accuracy of test data. Furthermore, it can also test the sealing performance of sealing components 11 in the CTB structure, such as the performance of sealing foam, sealing rubber, and sealing adhesive.

[0061] According to another specific embodiment of this utility model, since the sheet metal overlapping structure of the new energy vehicle floor assembly is not a structure where the sheet metals are completely overlapping, but rather at least two sheet metals are arranged vertically and fixedly connected along the vertical direction of the vehicle body, with at least two sheet metals overlapping at their fixed connection points, and the non-overlapping portions protruding relative to the other sheet metal, a sheet metal overlapping structure is formed. The relatively protruding portions are used for connection with other vehicle body structures. Therefore, as... Figure 3 , Figure 6 and Figure 7 As shown, the sealing test fixture 1 for the floor assembly of a new energy vehicle has flanges 1003 and recesses 1004 formed on the outer edges of opposite sides of the base plate 100. The flanges 1003 protrude from the corresponding side plates 101, and the side plates 101 protrude from the recesses 1004 of the corresponding base plate 100. One of the other two sides of the base plate 100 protrudes from the corresponding side plate 101, and the other side is closer to the center of the base plate 100 than the corresponding side plate 101. That is, one of the other two sides of the base plate 100 protrudes from the corresponding side plate 101, and the other side plate 101 protrudes from the base plate 100. This structure simulates the sheet metal overlapping structure of the lower body floor assembly. The protruding parts of the base plate 100 and the side plates 101 are used to connect with other structural components of the vehicle body.

[0062] It should be noted that, Figure 3 , Figure 6 and Figure 7 The diagram only shows one formation position of the flange 1003 and the recess 1004 on the opposite sides of the substrate 100, that is, the flange 1003 and the recess 1004 on the opposite sides of the substrate 100 are centrally symmetrical. In practice, they can also be formed axially symmetrically. This embodiment does not make a specific limitation, as long as the substrate 100 and the side plate 101 have a protruding part relative to the other to achieve connection with other structural parts of the vehicle body.

[0063] According to another specific embodiment of this utility model, such as Figures 3-5 , Figure 7 As shown, the sealing assembly 11 of the sealing test fixture 1 includes a first sealing member 110 and a second sealing member 111. The first sealing member 110 extends circumferentially along the substrate 100 and is clamped between the substrate 100, a plurality of side plates 101 and the battery cover simulation assembly 12. The second sealing member 111 is clamped between the substrate 100 and the plurality of side plates 101 and extends along the length direction Y of the side plates 101.

[0064] Specifically, since there is a gap between the lower body and the battery cover of the integrated battery body structure of new energy vehicles during installation, water leakage is likely to occur when the vehicle is wading through water. Sealing foam, sealing rubber and other sealing components are required. Therefore, the first sealing component 110 seals the base plate 100, multiple side plates 101 and the battery cover simulation component 12, thereby simulating the structure of the sealing component of the integrated battery body structure of new energy vehicles that seals the lower body and the battery cover.

[0065] It should be noted that the first sealing element 110 can be a sealing foam, a rubber sealing ring, a sealing adhesive, etc., as long as it can seal the substrate 100 and the battery cover simulation assembly 12.

[0066] In addition, since the sheet metal overlapping structure of the lower body is at least partially overlapping sheet metal connected to each other, there are gaps when the sheet metal is welded, which require sealing glue, sealing strips, etc. Therefore, a second sealing element 111 is clamped between the base plate 100 and the multiple side plates 101 to simulate the sealing glue or sealing strip of the sheet metal overlapping structure.

[0067] It should be noted that the shape of the second seal 111 can be strip-shaped, sheet-shaped, etc., such as Figure 3 and Figure 7 As shown, in this embodiment, the seal is preferably strip-shaped to seal the corresponding surfaces between the substrate 100 and the side plate 101. Furthermore, the second seal 111 can be a rubber strip or a fluid colloid. The colloid is applied between the substrate 100 and the side plate 101, and after curing, a seal is achieved, thus simulating the sealing of the overlapping parts of the lower vehicle body sheet metal.

[0068] According to another specific embodiment of the present invention, the first sealing element 110 of the sealing test fixture 1 for the new energy vehicle floor assembly includes a plurality of sealing rings stacked together. Figure 10 (This is a schematic diagram of a sealing ring), which extends circumferentially along the substrate 100.

[0069] Specifically, each sealing ring extends circumferentially along the substrate 100 to adapt to the structure of the connection between the substrate 100 and the battery cover simulated assembly 12, achieving a sealing purpose. By adjusting the number of sealing rings, different compression levels can be simulated when the first sealing element 110 is sealing foam. It is understood that those skilled in the art can set the number of sealing rings to 2, 3, 4, etc., according to actual needs, as long as different compression levels of sealing foam can be simulated by adjusting the number of sealing rings.

[0070] It should be noted that, according to CAE simulation analysis, the compression of sealing foam in actual vehicles is generally 20% to 80%. The sealing test fixture 1 provided in this embodiment controls the thickness of the first sealing element 110 by adjusting the number of sealing rings, thereby testing the effect of sealing foam with different compression amounts on the sealing performance of the vehicle battery integrated structure.

[0071] According to another specific embodiment of this utility model, such as Figure 4 , Figure 5 and Figure 11 As shown, the sealing assembly 11 also includes a third seal 112, and both ends of each side plate 101 and the side near the corresponding side edge of the substrate 100 are sealed to the substrate 100 through the third seal 112.

[0072] Specifically, because the overlapping sheet metal at the edges of the lower body panels is not on the same horizontal plane, sealant or sealing strips are needed to seal the joints and make the seams smoother. For example, in... Figure 2 The joint between the two sheet metal pieces shown is filled with sealant. Figure 2 (The shaded area is diagonal) to make the sheet metal joint smoother. Therefore, the connection between the two ends of the side plate 101 and the base plate 100 is sealed by the third seal 112 to simulate the sealing structure of the sheet metal overlap joint.

[0073] Furthermore, such as Figures 3-5 As shown, since the flange 1003 of the substrate 100 protrudes beyond the edge of the opposite side plate 101, the edge of the side plate 101 on the same side protrudes beyond the recess 1004 of the substrate 100, and the substrate 100 and side plate 101 on the other two sides also have portions protruding relative to the other, the connection points of the overlapping side edges of the substrate 100 and the side plate 101 are actually not on the same plane, forming a structure with a gradient difference at the edges (e.g., Figure 5 As shown, in order to eliminate the height difference formed by the overlap between the substrate 100 and the side plate 101, sealant is applied to the joint or a sealing strip is attached to make the side edges of the substrate 100 and the side plate 101 more smoothly connected.

[0074] It is understandable that, based on the second sealing member 111 sealing the corresponding surfaces of the substrate 100 and the side plate 101, a third sealing member 112 is further provided to seal the side edges of the substrate 100 and the side plate 101, which can achieve a double-layer seal for the substrate 100 and the side plate 101, thereby improving the sealing effect, and then the sealing performance of the sealing member at the sheet metal connection is tested by the sealing test fixture 1.

[0075] It should be noted that when the third seal 112 is a sealant, those skilled in the art can select a suitable type of sealant according to actual needs and test its performance.

[0076] The following explains the selection of sealant:

[0077] The selection of vehicle floor sealant mainly includes basic material selection, material parameter definition, and application scenario research. Based on the location of the joints in the CTB structure vehicle floor, the sealant's volume shrinkage rate must be sufficiently low (≤1%) to ensure that no obvious depressions appear after the sealant is smoothed, dried, and cured. The sealant also needs sufficient tensile strength (≥2 N / mm²). 2 To ensure that the sealant does not crack under pressure, it must meet certain requirements, including a high elongation at break (≥200%). Finally, considering the ease of application in paint shops, the sealant viscosity should not be too high (≤9 Pa·s). Specific materials such as polyvinyl chloride (PVC) adhesive and epoxy resin adhesive can be used.

[0078] After the sealant material is selected, product performance testing is required. The specific test items are as follows:

[0079] Adhesion Test: First, load the sealant into a plastic tube or other tubular object, and then evenly extrude a strip approximately 100mm long and 2mm-8mm in diameter onto a test plate from one end of the tube. Place the coated test piece in an oven and dry it according to the specified process and temperature. Then, use a utility knife to draw two parallel lines, 5mm apart, along the edge of the coating on the test plate, all the way to the substrate. Finally, peel off the coating and determine the adhesion grade based on the degree of peeling. The sealant should have an adhesion grade of at least 3 or higher.

[0080] Tensile strength test: Tested according to GB / T 528 standard, the recommended tensile strength is ≥2N / mm². 2 .

[0081] Elongation at break test: Tested according to GB / T 528 standard, it is recommended that the elongation at break be ≥200%.

[0082] Aging resistance test: Place the sample in a ventilated oven with an air circulation temperature accuracy of ±2℃, set the temperature to 90℃, and leave it for 1000 hours. After completing the above procedure, bend the sample 180℃. If the sealant does not crack and there are no changes in physical and mechanical properties, the test is passed.

[0083] Weather resistance test: Place the sample in a high and low temperature alternating damp heat test chamber, test the temperature from -40℃ to 80℃, and cycle the test 50 times. After completing the above procedure, bend the sample 180℃. If there is no cracking between the sealant and the bottom layer, the test is passed.

[0084] NSS Neutral Salt Spray Test: Test for 720 hours according to ISO 9227 standard. After the test, ensure that the adhesion of the sealant is ≥3 to pass the test.

[0085] Cyclic corrosion resistance test: The test is conducted in a cyclic salt spray test chamber for 90 cycles. After the test, the sealant adhesion is ≥ level 3 to pass the test.

[0086] It is understandable that when the second seal 111 is a sealant, the same principles and testing methods for selecting sealants can be applied.

[0087] It is understandable that, in addition to the above-described methods for selecting and testing sealants, the sealant can also be used for vehicle-level testing, based on the sealing test fixture 1 provided in this embodiment. Specific test items include:

[0088] Four-pillar durability and weathering test: When the vehicle passes the four-pillar durability and weathering test at 25%, 50%, 75%, and 100%, a static water immersion test and a dynamic water wading test are conducted to observe whether there is water leakage in the sheet metal joint area. After 100% completion, the vehicle is disassembled to observe the condition of the sealant.

[0089] 24-channel test: When the vehicle passes through 24 channels at 25%, 50%, 75%, and 100% progress, static immersion test and dynamic water wading test are performed to observe whether there is water leakage in the sheet metal joint area. After 100% completion, the vehicle is disassembled to observe the condition of the sealant.

[0090] PAVE test: The vehicle is subjected to static water immersion test and dynamic water wading test when passing through PAVE road conditions at 25%, 50%, 75%, and 100% progress. The sheet metal joint area is observed for water leakage. After 100% completion, the vehicle is disassembled to observe the condition of the sealant.

[0091] According to another specific embodiment of this utility model, such as Figure 3 , Figure 4 and Figure 7 As shown, each side plate 101 and the surface corresponding to the substrate 100 are provided with a plurality of point-shaped connecting portions 113 uniformly arranged along the length direction Y of the side plate 101.

[0092] In the sheet metal overlapping structure of the lower body, since the sheet metal is all plate-shaped, the overlapping area of ​​the corresponding surfaces is relatively large. Usually, a spot-applied adhesive welding method is used at the sheet metal overlap to make the sheet metal connection stronger. Therefore, multiple spot-shaped connection parts 113 are provided between the corresponding surfaces of each side plate 101 and the base plate 100, evenly arranged along the length Y direction of the side plate 101, so that the connection between each side plate 101 and the base plate 100 is stronger.

[0093] It should be noted that the dotted connection portion 113 can be a dotted adhesive or a metal solder joint, as long as it can fix and connect each side plate 101 and the substrate 100. The number of dotted connection portions 113 can be 3, 2, 4 or more, and this embodiment does not make a specific limitation, as long as each side plate 101 and the substrate 100 can be evenly connected. In order to achieve a better connection effect and save costs, such as Figure 3 and Figure 7 As shown, this embodiment preferably has 3 units.

[0094] According to another specific embodiment of this utility model, such as Figure 9 and Figure 10 As shown, a limiting portion 120 adapted to the shape of the first seal 110 is formed on the side of the battery cover simulation assembly 12 that is connected to the first seal 110.

[0095] Specifically, by forming a limiting part 120 adapted to the shape of the first seal 110 on the side where the battery cover simulation assembly 12 is connected to the first seal 110, the target installation position of the first seal 110 relative to the battery cover simulation assembly 12 can be more easily found according to the shape of the limiting part 120 when installing the first seal 110, so that the first seal 110 corresponds and fits the battery cover simulation assembly 12, avoiding gaps. At the same time, since the battery cover simulation assembly 12 is set to be adapted to the substrate 100, the first seal 110 is also adapted to the substrate 100. That is, the limiting part 120 makes the first seal 110 fit and install between the substrate 100 and the battery cover simulation assembly 12, thereby improving the sealing performance between the substrate 100 and the battery cover simulation assembly 12.

[0096] It should be noted that the limiting part 120 can be a laser-etched line for determining the position, or a limiting groove adapted to the shape of the first seal 110, as long as the installation position of the first seal 110 can be determined by the limiting part 120.

[0097] Furthermore, during testing after the sealing test fixture 1 is assembled, to facilitate observation of water leakage inside the sealing test fixture 1 from the side where the battery cover simulation component 12 is located, the battery cover simulation component 12 can be made of a transparent material. Specifically, the transparent material can be a transparent acrylic sheet, glass plate, or other components with a certain strength. To more realistically simulate the sheet metal material of the underbody, the base plate 100 and side plate 101 in this embodiment can be made of steel.

[0098] To make the structure of the sealing test fixture 1 provided in this embodiment clearer, the following describes its structure in conjunction with... Figure 11 The assembly process of each component of the sealing test fixture 1 mentioned above will be described.

[0099] First, four side plates 101 are respectively arranged around the perimeter of the substrate 100. On the side where the slot opening of the substrate 100 is located, welding adhesive is applied between the opposing surfaces of each side plate 101 and the corresponding substrate 100. After the adhesive cures, the side plate 101 and the substrate 100 are fixedly connected. A strip-shaped second sealing member 111 is also provided between the opposing surfaces of each side plate 101 and the corresponding substrate 100 to ensure a sealed connection between the side plate 101 and the substrate 100. Both ends of each side plate 101 and the side closest to the edge of its corresponding substrate 100 are further sealed to the substrate 100 via a third sealing member 112.

[0100] Next, the first sealing member 110 is installed to match the laser-etched lines on the battery cover simulation component 12, thus adapting the battery cover simulation component 12 to the substrate 100. To fix the lower body simulation component 10 and the battery cover simulation component 12 together, through holes are made at the four corners of the substrate 100, and the same number and size of through holes are made at the corresponding positions on the battery cover simulation component 12. The corresponding through holes are connected by bolts, nuts, and washers, thereby fixing the lower body simulation component 10 and the battery cover simulation component 12 together at the four corners. Since the substrate 100 is a thin plate and cannot be threaded, this embodiment uses internal and external threaded sleeves and hexagonal locking bolts for screwing, with a sealing gasket in the middle to ensure a sealing effect.

[0101] In addition, to facilitate water injection into the water inlet 1002 of the substrate 100, an adapter can be connected to the water inlet 1002, with the other end of the adapter connected to the water injection pipe. Specifically, a 3 / 4 threaded adapter can be connected externally. At this point, the sealing test fixture 1 is assembled, and the tester can inject water into the fixture to test its sealing performance.

[0102] Example 2

[0103] This utility model also provides a sealing test system for the floor assembly of a new energy vehicle, such as... Figure 12 As shown, it includes: a water injection device 2, and a plurality of sealing test fixtures 1 as described in Embodiment 1 above, which are connected to the water injection device 2; wherein, the water outlet of the water injection device 2 is connected to the water injection port 1002 on the substrate 100 of at least one of the plurality of sealing test fixtures 1.

[0104] Water is injected into the water inlet 1002 on the substrate 100 in the sealing test fixture 1 by the water injection device 2. The sealing performance of the test fixture is detected by observing whether the sealing test fixture 1 leaks water. Specifically, the location of the leak or the amount of water entering within a certain water inlet time can be observed, which facilitates the inspection of the sealing performance of the battery body integrated structure.

[0105] According to another specific embodiment of this utility model, the water injection device 2 includes a water tank 20, a connecting pipe 21, and a multi-way valve 22. The connecting pipe 21 is disposed between the water outlet of the water tank 20 and the water injection ports 1002 of multiple sealing test fixtures 1; the multi-way valve 22 is disposed in the connecting pipe 21, and the water outlet of the water tank 20 is selectively connected to the water injection port 1002 on the substrate 100 of at least one of the multiple sealing test fixtures 1 through the multi-way valve 22. The water outlet of the water tank 20 is connected to the water injection ports 1002 (or adapters) of the multiple test fixtures through the connecting pipe 21. The multi-way valve 22 can connect to the water injection ports 1002 on the substrate 100 of the multiple sealing test fixtures, and by controlling the opening and closing of the multi-way valve 22, water can be selectively injected into the water injection port 1002 on the substrate 100 of the corresponding sealing test fixture 1. The water injection volume can be controlled by the water injection mark 200 on the water tank 20, thereby controlling the water injection pressure in the test fixture.

[0106] It is understandable that the number of multiple sealing test fixtures 1 can be set to 2, 3, 4, etc. as needed by those skilled in the art, as long as multiple sealing test fixtures 1 can be connected by connecting pipes to test multiple sealing test fixtures 1 at the same time, thereby improving testing efficiency.

[0107] It should be noted that the multi-way valve 22 can be a two-way valve, a three-way valve, a four-way valve, etc. The specific connection ports and the number of sealing test fixtures 1 that can be connected can be determined by those skilled in the art as needed, and this embodiment does not impose any restrictions.

[0108] To ensure a tight connection between the connecting pipe 21 and the outlet of the water tank 20 and the water inlet 1002 of the multiple sealing test fixtures 1, and to prevent leakage, a clamp can be installed at the end of the connecting pipe 21 to tighten it.

[0109] To facilitate understanding of the usage of the sealing test system provided in this embodiment, the actual test operation process of the sealing test system provided in this embodiment will be described below, wherein the third sealing element 112 is preferably a sealant.

[0110] Normal temperature condition test: Prepare a water tank 20 with a water filling mark of 200 and a volume of 1m. Connect at least one sealing test fixture 1 to the water outlet of the water tank 20 at the bottom of the water tank 20 through a connecting pipe 21 and run water for 24 hours. Observe whether the sealing test fixture 1 leaks water. Then open the sealing test fixture 1 to check the condition of the sealant. It is required that after running water for 24 hours, the leakage of the sealing test fixture 1 should not exceed 5ml and the sealant should not crack. This indicates that the normal temperature condition test has been passed.

[0111] High temperature and high humidity test: Place the sealing test fixture 1 in a ventilated oven with an air circulation temperature accuracy of ±2℃, set the temperature to 90℃, and leave it for 1000h. After completion, circulate water for 24h and observe the sealing effect and sealant condition of the sealing test fixture 1.

[0112] High and low temperature shock test: Place the sealing test fixture 1 in a high and low temperature alternating damp heat test chamber, test the temperature from -40℃ to 80℃, cycle the test 50 times, then circulate water for 24 hours, and observe the sealing effect of the fixture and the state of the sealant.

[0113] Corrosion resistance test: After 30 cycles of testing according to GB / T 2423.18-2012 standard, water was circulated for 24 hours, and the sealing effect and sealant condition of sealing test fixture 1 were observed.

[0114] The above testing methods can be used to test the sealing performance of sheet metal overlap structures and the performance of sealant used to fill gaps in sheet metal joints.

[0115] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to that embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived from the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0116] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0117] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the 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 the utility model.

[0118] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0119] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" 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 embodiment based on the specific circumstances.

[0120] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A sealing test fixture for a new energy vehicle floor assembly, characterized in that, It includes a lower body simulation assembly, a battery top cover simulation assembly, and a sealing assembly that is sealed between the lower body simulation assembly and the battery top cover simulation assembly; in The vehicle body simulation assembly includes a base plate and multiple side plates. The center portion of the base plate has a recessed groove extending from its top to its bottom. The multiple side plates are respectively disposed around the base plate and overlap and are fixed to the corresponding side edges of the base plate. The battery cover simulation assembly is configured to fit the base plate and is fixedly connected to the side of the base plate where the groove is located, and at least covers the multiple side plates. The sealing assembly extends circumferentially along the base plate and is clamped between the base plate and the battery cover simulation assembly, and at least a portion of the sealing assembly extends between the multiple side plates and the battery cover simulation assembly. The base plate is provided with a water inlet communicating with the inside and outside of the groove.

2. The sealing test fixture for the new energy vehicle floor assembly as described in claim 1, characterized in that, The outer edges of the opposite two sides of the substrate are formed with flanges and recesses, the flanges protruding from the corresponding side plates and the side plates protruding from the recesses; one of the other two sides of the substrate protrudes from the corresponding side plates, and the other side is closer to the center of the substrate than the corresponding side plates.

3. The sealing test fixture for the new energy vehicle floor assembly as described in claim 1, characterized in that, The sealing assembly includes a first seal and a second seal. The first seal extends circumferentially along the substrate and is clamped between the substrate, the plurality of side plates, and the battery cover simulation assembly. The second seal is clamped between the substrate and the plurality of side plates and extends along the length of the side plates.

4. The sealing test fixture for the new energy vehicle floor assembly as described in claim 3, characterized in that, The first sealing element includes a plurality of sealing rings stacked together, the sealing rings extending circumferentially along the substrate.

5. The sealing test fixture for the new energy vehicle floor assembly as described in claim 3, characterized in that, The sealing assembly further includes a third seal, wherein both ends of each side plate and one side near the corresponding edge of the substrate are sealed to the substrate via the third seal.

6. The sealing test fixture for the new energy vehicle floor assembly as described in claim 3, characterized in that, Each of the side plates has a plurality of point-shaped connecting portions uniformly arranged along the length direction of the side plate between its corresponding surface and the substrate.

7. The sealing test fixture for the new energy vehicle floor assembly as described in claim 3, characterized in that, The side of the battery cover simulation assembly connected to the first seal has a limiting part that is adapted to the shape of the first seal.

8. The sealing test fixture for the new energy vehicle floor assembly as described in any one of claims 1-7, characterized in that, The battery cover simulates an assembly made of transparent material.

9. A sealing test system for a new energy vehicle floor assembly, characterized in that, include: A water injection device, and a plurality of test fixtures as described in any one of claims 1-8 connected to the water injection device; wherein... The outlet of the water injection device is connected to the water injection pipe on the substrate of at least one of the plurality of test fixtures.

10. The sealing test system for the new energy vehicle floor assembly as described in claim 9, characterized in that, The water injection device includes a water tank, connecting pipes, and a multi-way valve; wherein The water tank is marked with a water filling mark; the connecting pipe is located between the water outlet of the water tank and the water filling port of the plurality of test fixtures; the multi-way valve is located in the connecting pipe, and the water outlet of the water tank is selectively connected to the water filling port pipeline on the substrate of at least one of the plurality of test fixtures through the multi-way valve.

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