Test sample piece of battery and vehicle body integrated structure, sealing performance test equipment and method

Abstract

The invention provides a test sample piece of a battery and vehicle body integrated structure and a sealing performance test device and method, and the test sample piece comprises a sealing ring sample piece which simulates a sealing ring of the battery and vehicle body integrated structure and is shorter than the sealing ring; the tool is arranged to simulate the sealing surface of the battery and vehicle body integrated structure and is matched with the sealing ring sample piece and the section of the sealing ring meeting the preset compression ratio in the simulation model of the battery and vehicle body integrated structure; the sealing ring sample piece is fixed and compressed on a tool, and a closed cavity is defined by the sealing ring sample piece and the tool; the shape of the section of the compressed sealing ring sample piece is consistent with that of the section of the sealing ring meeting the preset compression ratio after being rotated by 180 degrees. The sealing performance of the test sample piece, namely the battery and vehicle body integrated structure, is detected by injecting water into the cavity of the test sample piece and observing whether water seepage exists outside the test sample piece, and a redundant structure of the battery and vehicle body integrated structure is removed, so that the development cost can be saved, and the development period can be shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery-body integration, and in particular relates to a test sample of a battery-body integration structure, a sealing test design method and corresponding sealing test equipment. Background Art

[0002] In order to meet water-related regulations and ensure driving safety, OEMs need to design seals for vehicle parts and subsystems to meet different levels of sealing requirements. New energy vehicles all have battery packs. Cell to Body (CTB) technology deeply integrates the battery pack with the vehicle body while also increasing the difficulty of sealing. There are many sealing components, but considering the maintainability of the battery pack during after-sales service, existing CTB models generally choose to use a sealing ring to seal between the lower body sheet metal and the battery cover.

[0003] At present, the effective compression rate of the silicone foam in the battery-body integrated structure is determined to be ≥20% based on the component sealing test of the actual vehicle through simulating the static standard working conditions, and then the compression rate of the whole vehicle is set considering the distribution of the dimension chain. Finally, the sealing test experiment of the battery-body integrated structure is designed based on the set vehicle compression rate. The commonly used sealing test experiment of the battery-body integrated structure is to soak the entire battery-body integrated structure for a certain period of time and then open the internal structure to observe whether there is water leakage. Not only is the operation complicated, but it is also difficult to accurately identify the leakage point when the internal structure has a large amount of water inflow. Moreover, since the outside of the battery-body integrated structure has been in contact with water before opening, the water outside is easily brought into the internal structure during the opening process, which is prone to misjudgment. At the same time, the method of directly immersing the battery-body integrated structure requires the mold to make real batteries and bodies during the vehicle production stage. This not only has a high R&D cost for the bench experiment, but also once the experimental results show that the battery-body integrated structure has water leakage, the whole vehicle needs to be redesigned and adjusted, and the development cycle is extended. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that in the prior art, the sealing test experiment of the battery-body integrated structure is generally carried out by immersing it first and then opening the internal structure for observation, which is complicated. When a large amount of water enters the internal structure, it is difficult to accurately identify the leakage point, and misjudgment is easy to occur, thereby affecting the accuracy of the test results and the safety of the vehicle. In addition, the current research and development cost of the sealing test bench experiment of the battery-body integrated structure is relatively high. Once the experimental results show that the battery-body integrated structure has a leakage, it will also lead to an extended development cycle.

[0005] To solve the above problems, an embodiment of the present invention discloses a test sample of a battery-body integrated structure, wherein the battery-body integrated structure includes a lower body, a battery and a sealing ring, wherein a sealing surface is provided between the lower body and the upper cover of the battery, and the sealing ring is pressed into the sealing surface; the test sample simulates the battery-body integrated structure, and includes: a sealing ring sample, wherein the sealing ring sample is configured to simulate a sealing ring of the battery-body integrated structure and has a length smaller than the sealing ring; a tooling, wherein the tooling is configured to simulate a sealing surface of the battery-body integrated structure and to match the cross-sections of the sealing rings that meet a preset compression rate in the sealing ring sample and the simulation model of the battery-body integrated structure; and the sealing ring sample is fixed and compressed on the tooling, and a closed cavity is formed around the sealing ring sample and the tooling; wherein the cross-section of the sealing ring sample after compression is consistent with the shape and size of the cross-section of the sealing ring that meets the preset compression rate after rotating 180°.

[0006] By adopting the above technical solution, the test sample of the battery-body integrated structure simulates the battery-body integrated structure, including a sealing ring sample simulating the sealing ring of the battery-body integrated structure and having a length less than the sealing ring, and a tooling simulating the sealing surface of the battery-body integrated structure, and the tooling matches the sealing ring sample and the cross section of the sealing ring that meets the preset compression rate in the simulation model of the battery-body integrated structure. In this way, the test sample removes the redundant structure in the battery-body integrated structure and only simulates the key structure in the battery-body integrated structure, which can not only save development costs, but also prevent various actual scenario problems in advance without waiting until the vehicle manufacturing stage to open the mold and make the real battery and body, which can shorten the development cycle.

[0007] Since the length of the sealing ring sample is smaller than the sealing ring in the battery-body integrated structure, the volume of the tooling will also be smaller than the volume of the sealing surface of the battery-body integrated structure. Therefore, the volume of the test sample is significantly smaller than the entire battery-body integrated structure. The smaller test sample replaces the entire battery-body integrated structure and saves the R&D cost of the bench experiment.

[0008] In addition, the sealing ring sample is fixed and compressed on the tooling, and the cross section of the compressed sealing ring sample in the test sample is made consistent with the shape and size of the cross section of the sealing ring that meets the preset compression rate after being rotated 180°, so as to form a test sample, and the sealing ring sample and the tooling form a closed cavity. This is equivalent to turning the sealing ring sample inside out, so that the inside of the cavity of the sealing ring sample simulates the water inflow environment outside the vehicle of the battery-body integrated structure, and the outside of the sealing ring sample corresponds to the water leakage area inside the vehicle of the battery-body integrated structure. Therefore, the sealing of the test sample, i.e., the battery-body integrated structure, can be detected by injecting water into the cavity of the test sample and observing whether there is water seepage on the outside of the test sample. In this way, it is possible to directly observe and judge whether there is a water leakage point in the water inflow environment outside the vehicle, and it is not easy to make a misjudgment.

[0009] According to another specific embodiment of the present invention, the test sample disclosed in the embodiment of the present invention, the tooling includes an upper part and a lower part that are detachably fixedly connected, the sealing ring sample is fixed and compressed between the upper part and the lower part, and the upper part, the lower part and the sealing ring sample form a cavity.

[0010] By adopting the above technical solution, the tooling includes an upper part and a lower part which are detachably fixedly connected, and the sealing ring sample is fixed and compressed between the upper part and the lower part, so as to facilitate the disassembly and fixation of the sealing ring sample.

[0011] According to another specific embodiment of the present invention, the test sample disclosed in the embodiment of the present invention, the tooling also includes a gasket, the gasket is arranged between the upper part and the lower part and is located in the cavity, and the thickness of the gasket is set corresponding to the size chain distribution range of the sealing surface of the battery body integrated structure.

[0012] By adopting the above technical solution, the size chain distribution range of the sealing surface corresponding to different sealing requirements of the tooling is different. By setting the gasket between the upper and lower parts and in the cavity, the thickness of the gasket is set corresponding to the size chain distribution range of the sealing surface of the battery-body integrated structure, so that different sealing requirements of the tooling can be met by using gaskets of different thicknesses.

[0013] According to another specific embodiment of the present invention, the test sample disclosed in the embodiment of the present invention, the tooling also includes a groove, the groove is arranged on the surface where the tooling contacts the sealing ring sample, and the groove simulates the groove of the sealing surface of the battery body integrated structure.

[0014] With the above technical solution, since the lower body of the battery-body integrated structure is made of multiple sheet metals, there are discontinuous features such as step surfaces at the sheet metal joints to form grooves. Compared with smooth surfaces, it is more likely for water to seep in the grooves. Therefore, a groove is set on the surface where the tooling contacts the sealing ring sample, and the groove simulates the groove of the sealing surface of the battery-body integrated structure, so that this process risk on the lower body can be identified in advance and the process optimization can be guided.

[0015] According to another specific embodiment of the present invention, the test sample disclosed in the embodiment of the present invention, the tooling also includes a positioning part for positioning the sealing ring sample.

[0016] By adopting the above technical solution, since the position of the sealing ring sample in the test sample will affect the sealing performance of the test sample, the positioning part is provided to limit the laying area of ​​the sealing ring sample, thereby improving the consistency of the experimental results.

[0017] According to another specific embodiment of the present invention, the test sample disclosed in the embodiment of the present invention, the tooling also includes a pressure relief valve, and the pressure relief valve is connected to the cavity.

[0018] By adopting the above technical solution, a pressure relief valve is provided, which is connected to the cavity. When water is pressurized into the cavity for a sealing test, the presence of gas inside the cavity that affects the observation of water penetration and the sealing judgment of the test sample is avoided.

[0019] The present invention also provides a sealing test device for a battery-body integrated structure, comprising: the above-mentioned test sample; and a pressurizing device, wherein the pressurizing device is configured to pressurize and inject water into the closed cavity formed by the sealing ring sample and the tooling of the test sample to detect the sealing of the test sample.

[0020] The above technical solution is adopted, and a pressurizing device is set up to pressurize and inject water into the sealed cavity formed by the sealing ring sample and the tooling of the test sample to detect the sealing of the test sample, thereby checking the sealing of the battery body integrated structure. Since the inside of the tooling corresponds to the water inflow environment outside the vehicle, and the outside of the tooling corresponds to the water leakage area inside the vehicle, during the experiment, it is possible to directly observe and judge whether there is a water leakage point in the water inflow environment outside the vehicle, and it is not easy to make a misjudgment.

[0021] According to another specific embodiment of the present invention, in the sealing testing equipment of the battery-body integrated structure disclosed in the embodiment of the present invention, a water injection mark corresponding to a preset waterproof level is provided on the pressurizing device, and the pressurizing device pressurizes and injects water into the cavity according to the preset waterproof level to detect the waterproof level of the test sample.

[0022] By adopting the above technical solution, by setting the water injection mark corresponding to the preset waterproof level of the test sample on the pressurizing device, water can be directly injected according to the position of the water injection mark during the sealing test of the battery-body integrated structure. Thereafter, water is injected into the closed cavity formed by the sealing ring sample and the tooling of the test sample through the pressurizing device, so as to test whether the waterproof level of the test sample, i.e. the battery-body integrated structure, meets the requirements.

[0023] According to another specific embodiment of the present invention, in the sealing test equipment of the battery-body integrated structure disclosed in the embodiment of the present invention, the pressurizing device includes a water tank, a connecting pipe and a valve; wherein the connecting pipe is arranged between the water tank and the test sample to connect the water tank and the test sample, the valve is arranged on the connecting pipe, and the water filling mark is arranged on the water tank.

[0024] The above technical solution is adopted, and the pressurizing device includes a water tank, a connecting pipe and a valve, and the connecting pipe is arranged between the water tank and the test sample, and is used to connect the water tank and the test sample, and the valve is arranged on the connecting pipe. When the valve is closed, water is injected into the water tank according to the water injection mark to realize external pressurization. After the test sample is installed, the valve can be opened to inject water into the test sample, so as to perform a sealing test on the test sample.

[0025] The present invention also provides a sealing test method for a battery-body integrated structure, wherein the battery-body integrated structure comprises a lower body, a battery and a sealing ring, wherein a sealing surface is provided between the lower body and an upper cover of the battery, and the sealing ring is pressed into the sealing surface; the sealing test method comprises:

[0026] S1: Establish a whole vehicle simulation model, the whole vehicle simulation model includes a battery body integrated structure simulation model simulating the battery body integrated structure, and obtain the cross section of the sealing ring of the battery body integrated structure simulation model that meets a preset compression rate.

[0027] S2: Make a sealing ring sample that simulates the sealing ring of the battery-body integrated structure and is shorter than the sealing ring, and make a tooling that simulates the sealing surface of the battery-body integrated structure and matches the cross-section of the sealing ring sample and the sealing ring that meets the preset compression rate. Fix and compress the sealing ring sample on the tooling, so that the cross-section of the compressed sealing ring sample in the test sample is consistent with the cross-section of the sealing ring that meets the preset compression rate after rotating 180°, so as to form a test sample, and the sealing ring sample and the tooling form a closed cavity.

[0028] S3: Pressurize the cavity with water to detect the sealing of the test sample.

[0029] Using the above technical solution, the sealing test design method includes: obtaining the cross section of the sealing ring of the battery-body integrated structure simulation model that meets the preset compression rate. Then, a sealing ring sample that simulates the sealing ring of the battery-body integrated structure and is shorter than the sealing ring is made, and a tooling is made that simulates the sealing surface of the battery-body integrated structure and matches the cross section of the sealing ring that meets the preset compression rate in the sealing ring sample and the battery-body integrated structure simulation model. The sealing ring sample is fixed and compressed on the tooling, so that the cross section of the compressed sealing ring sample in the test sample is consistent with the shape and size of the cross section of the sealing ring that meets the preset compression rate after rotating 180°, so as to form a test sample, and the sealing ring sample and the tooling form a closed cavity. Finally, pressurize the cavity with water to detect the sealing of the test sample, that is, the battery-body integrated structure. Since the sealing ring sample is fixed and compressed on the tooling, and the cross-section of the sealing ring sample after compression in the test sample is consistent with the shape and size of the cross-section of the sealing ring that meets the preset compression rate after rotating 180°, it is equivalent to turning the sealing ring sample inside out, that is, the inside of the tooling corresponds to the water inflow environment outside the vehicle, and the outside of the tooling corresponds to the water leakage area inside the vehicle. By pressurizing the cavity with water, it is possible to directly observe and judge whether there is a leakage point in the water inflow environment outside the vehicle, and it is not easy to make a misjudgment.

[0030] In addition, the test sample only simulates the key structure of the battery-body integrated structure, except for the redundant structure in the battery-body integrated structure, which not only saves development costs, but also prevents various practical scenario problems in advance without waiting until the vehicle manufacturing stage to open the mold and make the real battery and body, which can shorten the development cycle. And replacing the entire battery-body integrated structure with a smaller test sample also saves the research and development cost of the bench experiment.

[0031] According to another specific embodiment of the present invention, in the sealing test method of the battery-body integrated structure disclosed in the embodiment of the present invention, in step S1, the cross-section of the sealing ring that meets the preset compression rate of the battery-body integrated structure simulation model under dynamic conditions is obtained, and the dynamic conditions include pedaling conditions, torsion conditions, bending conditions and assembly conditions.

[0032] By adopting the above technical solution, the cross-section of the sealing ring that meets the preset compression rate is obtained based on dynamic working conditions, i.e. simulating actual user scenarios such as stepping on, twisting, bending and assembly. This can reflect the deformation of the lower body and the upper cover of the battery in actual user scenarios, identify the risks of actual user scenarios, and thus improve the practicality of the sealing test results.

[0033] According to another specific embodiment of the present invention, in the sealing test method of the battery-body integrated structure disclosed in the embodiment of the present invention, in step S1, the preset compression rate is 10% to 30%.

[0034] According to another specific embodiment of the present invention, the sealing test method of the battery-body integrated structure disclosed in the embodiment of the present invention further includes before step S3: S2': subjecting the test sample to a durability test, and then executing step S3, wherein the durability test includes a high temperature and high humidity test, a hot and cold shock test, and a continuous high temperature and salt spray test.

[0035] The above technical solution is adopted, taking into account that the sealing ring may experience material aging and permanent deformation under actual circumstances. Therefore, the test samples are subjected to durability tests including high temperature and high humidity tests, hot and cold shock tests, and continuous high temperature and salt spray tests, and then pressurized water is injected into the cavity to detect the sealing of the test samples. This can detect whether the test sample, i.e., the battery-body integrated structure, still has a sealing function under actual circumstances, thereby improving the practicality of the sealing test results.

[0036] According to another specific embodiment of the present invention, in the sealing test method of the battery-body integrated structure disclosed in the embodiment of the present invention, in step S2, making a sealing ring sample that simulates the sealing ring of the battery-body integrated structure includes: obtaining first parameters of the sealing ring of the battery-body integrated structure, and making the sealing ring sample according to the first parameters; wherein the first parameters include the material and cross-sectional size of the sealing ring of the battery-body integrated structure.

[0037] By adopting the above technical scheme, the first parameters of the sealing ring of the battery-body integrated structure, namely the material and cross-sectional dimensions of the sealing ring of the battery-body integrated structure, are obtained to make a sealing ring sample. This can make the performance of the sealing ring sample closest to the performance of the sealing ring of the battery-body integrated structure, thereby improving the accuracy of the sealing test results.

[0038] According to another specific embodiment of the present invention, in the sealing test method of the battery-body integrated structure disclosed in the embodiment of the present invention, in step S2, a tooling for simulating the sealing surface of the battery-body integrated structure is manufactured, including obtaining second parameters of the sealing surface of the battery-body integrated structure, and manufacturing the tooling according to the second parameters; wherein the second parameters include parameters of the lower body in the battery-body integrated structure and parameters of the upper cover of the battery.

[0039] By adopting the above technical solution, the second parameters of the sealing surface of the battery-body integrated structure, i.e., the parameters of the lower body in the battery-body integrated structure and the parameters of the upper cover of the battery, are obtained to make the tooling. This can make the performance of the tooling closest to the performance of the sealing surface of the battery-body integrated structure, thereby improving the accuracy of the sealing test results.

[0040] According to another specific embodiment of the present invention, in the sealing test method of the battery-body integrated structure disclosed in the embodiment of the present invention, in step S2, the tooling includes an upper part and a lower part that are detachably fixedly connected, the sealing ring sample is fixed and compressed between the upper part and the lower part, and the upper part, the lower part and the sealing ring sample form a cavity; the upper part is made according to the parameters of the lower body of the battery-body integrated structure, the parameters of the lower body include the structure of the side of the lower body close to the sealing surface, the structure includes a groove, and the side of the upper part close to the sealing ring sample is matched with the side of the cross-section of the sealing ring close to the lower body; the lower part is made according to the parameters of the upper cover of the battery of the battery-body integrated structure, the parameters of the upper cover of the battery include the structure of the side of the upper cover of the battery close to the sealing surface, and the side of the lower part close to the sealing ring sample is matched with the side of the cross-section of the sealing ring close to the upper cover of the battery.

[0041] By adopting the above technical solution, the tooling includes an upper part and a lower part that are detachably fixedly connected, so that the side of the upper part close to the sealing ring sample matches the side of the sealing ring section close to the lower body, and the side of the lower part close to the sealing ring sample matches the side of the sealing ring section close to the upper cover of the battery, so that after the upper and lower parts are fixedly connected, the section of the sealing ring sample after compression in the test sample can be consistent with the shape of the section of the sealing ring that meets the preset compression rate after rotating 180°, so that the performance of the sealing ring sample and the sealing ring are closest, and the accuracy of the sealing test results is improved. In addition, the inside of the cavity of the sealing ring sample simulates the water inflow environment outside the vehicle of the battery-body integrated structure, and the outside of the sealing ring sample corresponds to the water leakage area inside the vehicle of the battery-body integrated structure. Therefore, the sealing of the test sample, i.e., the battery-body integrated structure, can be detected by injecting water into the cavity of the test sample and observing whether there is water seepage on the outside of the test sample.

[0042] According to another specific embodiment of the present invention, the sealing test method of the battery-body integrated structure disclosed in the embodiment of the present invention also includes before step S2: S1': determining the size chain distribution range of the sealing surface of the battery-body integrated structure; in step S2, making a tooling for simulating the sealing surface of the battery-body integrated structure, and also includes: making the tooling according to the second parameter and the size chain distribution range; the tooling also includes a gasket, the gasket is arranged between the upper and lower parts and is located in the cavity, and the thickness of the gasket is set corresponding to the determined size chain distribution range.

[0043] By adopting the above technical solution, the size chain distribution range of the sealing surface corresponding to different sealing requirements of the tooling is different. According to the size chain distribution range of the sealing surface of the battery-body integrated structure, the thickness of the gasket arranged between the upper and lower parts is adjusted to meet the sealing performance of the test sample under different sealing requirements of the tooling, that is, the battery-body integrated structure.

[0044] According to another specific embodiment of the present invention, the sealing test method of the battery-body integrated structure disclosed in the embodiment of the present invention, in step S3, pressurizing water into the cavity to detect the sealing of the test sample includes: setting a pressurizing device, pressurizing water into the cavity according to a preset waterproof level by the pressurizing device to detect the waterproof level of the test sample, and providing a water injection mark corresponding to the preset waterproof level on the pressurizing device.

[0045] By adopting the above technical solution, a pressurizing device is used and a water injection mark corresponding to the preset waterproof level of the test sample is set on the pressurizing device. During the sealing test of the battery-body integrated structure, water can be directly injected according to the position of the water injection mark. After that, water is injected into the closed cavity formed by the sealing ring sample and the tooling of the test sample through the pressurizing device, so as to test whether the waterproof level of the test sample meets the requirements.

[0046] The beneficial effects of the present invention are:

[0047] The test sample of the battery-body integrated structure provided by the present invention is used to simulate the battery-body integrated structure, including a sealing ring sample simulating the sealing ring of the battery-body integrated structure and having a length less than the sealing ring, and a tooling simulating the sealing surface of the battery-body integrated structure, and the tooling matches the sealing ring sample and the cross section of the sealing ring that meets the preset compression rate. In this way, the test sample removes the redundant structure in the battery-body integrated structure and only simulates the key structure in the battery-body integrated structure, which can not only save development costs, but also can prevent various actual scenario problems in advance without waiting until the whole vehicle manufacturing stage to open the mold and make the real battery and body, which can shorten the development cycle.

[0048] Since the length of the sealing ring sample is smaller than the sealing ring in the battery-body integrated structure, the volume of the tooling will also be smaller than the volume of the sealing surface of the battery-body integrated structure. Therefore, the volume of the test sample is significantly smaller than the entire battery-body integrated structure. The smaller test sample replaces the entire battery-body integrated structure and saves the R&D cost of the bench experiment.

[0049] In addition, the sealing ring sample is fixed and compressed on the tooling, and the cross section of the compressed sealing ring sample in the test sample is made consistent with the shape and size of the cross section of the sealing ring that meets the preset compression rate after being rotated 180°, so as to form a test sample, and the sealing ring sample and the tooling form a closed cavity. This is equivalent to turning the sealing ring sample inside out, so that the inside of the cavity of the sealing ring sample simulates the water inflow environment outside the vehicle of the battery-body integrated structure, and the outside of the sealing ring sample corresponds to the water leakage area inside the vehicle of the battery-body integrated structure. Therefore, the sealing of the test sample, i.e., the battery-body integrated structure, can be detected by injecting water into the cavity of the test sample and observing whether there is water seepage on the outside of the test sample. In this way, it is possible to directly observe and judge whether there is a water leakage point in the water inflow environment outside the vehicle, and it is not easy to make a misjudgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a schematic cross-sectional structure diagram of a test sample of a battery-body integrated structure provided in Example 1 of the present invention;

[0051] Figure 2 It is a schematic diagram of a cross section of a sealing ring of a simulation model of a battery-body integrated structure provided by the present invention that meets a preset compression rate;

[0052] Figure 3 is a schematic cross-sectional structure diagram of another position of a test sample of the battery-body integrated structure provided in Example 1 of the present invention;

[0053] Figure 4 is a schematic structural diagram of a test sample of a battery-body integrated structure provided in Example 1 of the present invention;

[0054] Figure 5 1 is a schematic diagram of the structure of the upper part of the test sample of the battery-body integrated structure provided in Example 1 of the present invention, viewed from above;

[0055] Figure 6 is a schematic diagram of the top view of the lower part of the test sample of the battery-body integrated structure provided in Example 1 of the present invention;

[0056] Figure 7 2 is a schematic diagram of the structure of a sealing test device for a battery-body integrated structure provided in Example 2 of the present invention;

[0057] Figure 8 It is a schematic cross-sectional structure diagram of a test sample, a connecting pipe and a valve of a sealing test device for a battery-body integrated structure provided in Example 2 of the present invention;

[0058] Fig. 9 is a schematic flow chart of a method for testing the sealing performance of a battery-body integrated structure provided in Example 3 of the present invention;

[0059] Fig.10 It is another schematic flow chart of the sealing test method of the battery-body integrated structure provided in Example 3 of the present invention.

[0060] Description of reference numerals:

[0061] 10: test sample; 100: sealing ring sample; 200: tooling; 210: upper part; 220: lower part; 230: gasket; 240: groove; 250: positioning part; 260: pressure relief valve; 300: cavity;

[0062] 20: pressurizing device; 21: water tank; 22: connecting pipe; 23: valve. DETAILED DESCRIPTION

[0063] Example 1

[0064] In order to solve the problem that the sealing test experiment of the battery-body integrated structure of a vehicle in the prior art generally involves immersing the vehicle first and then opening the internal structure for observation, the operation is complicated, and when a large amount of water enters the internal structure, it is difficult to accurately identify the leakage point, and misjudgment is easy to occur, thereby affecting the accuracy of the test results and the safety of the vehicle. In addition, the current research and development cost of the sealing test bench experiment of the battery-body integrated structure is relatively high. Once the experimental results show that the battery-body integrated structure has a leakage, the development cycle is extended. The present invention provides a test sample of the battery-body integrated structure, which can not only save the research and development cost of the bench experiment and shorten the development cycle, but also can directly observe and judge whether there is a leakage point in the water inflow environment outside the vehicle, thereby solving the problem of misjudgment that is easy to occur in the current sealing test process.

[0065] Next, refer to the attached Figure 1-Figure 6 , the structure and advantages of the test sample of the battery-body integrated structure provided by the present invention are described in detail.

[0066] The battery-body integrated structure includes a lower body, a battery and a sealing ring. A sealing surface is provided between the lower body and the upper cover of the battery, and the sealing ring is pressed into the sealing surface.

[0067] It should be noted that the sealing ring is annular and has no cross section and is pressed into the sealing surface. Generally speaking, the surface where the battery is hung on the lower body is the mounting surface, and the surface that seals the gap between the lower body and the upper cover of the battery is the sealing surface. Depending on different structural designs, the mounting surface may or may not be a sealing surface.

[0068] The test sample of the battery-body integrated structure provided by the present invention is as follows: Figure 1 As shown, the test sample 10 simulates the battery-body integrated structure and includes: a sealing ring sample 100 and a tooling 200 .

[0069] The sealing ring sample 100 is configured as a sealing ring that simulates the battery-body integrated structure and has a length smaller than the sealing ring.

[0070] In this embodiment, the sealing ring sample 100 simulates the sealing ring of the battery-body integrated structure and specifically includes: the material of the sealing ring simulating the battery-body integrated structure and the dimensions other than the length (such as the cross-sectional shape and size). The material of the sealing ring is generally selected according to the replacement of the sealing ring, the requirements for the flatness of the vehicle body, and the input of the production line process. Specifically, it can be silicone foam or polyurethane foam material. The length of the sealing ring sample 100 is less than the length of the sealing ring of the battery-body integrated structure. The specific length of the sealing ring sample 100 is not specifically limited, and those skilled in the art can set it according to the actual situation.

[0071] The tooling 200 is configured to simulate the sealing surface of the battery-body integrated structure and to match the cross-section of the sealing ring sample 100 and the sealing ring in the simulation model of the battery-body integrated structure that meets a preset compression rate.

[0072] In this embodiment, the sealing surface simulating the battery-body integrated structure specifically includes: the material and structure of the sealing surface simulating the battery-body integrated structure.

[0073] In this embodiment, a simulation model of the whole vehicle is established or obtained. Since the whole vehicle includes a battery-body integrated structure, the simulation model of the whole vehicle also includes a simulation model of the battery-body integrated structure. Therefore, the simulation model of the battery-body integrated structure can be obtained through the simulation model of the whole vehicle. Since the battery-body integrated structure includes a lower body, a battery, and a sealing ring, the simulation model of the battery-body integrated structure also includes the lower body, a battery, and a sealing ring. In the simulation model of the battery-body integrated structure, the following is captured: Figure 2 The cross section of the sealing ring that meets the preset compression rate shown is 10% to 30%. The tooling 200 matches the sealing ring sample 100 and the cross section of the sealing ring that meets the preset compression rate. Specifically, the tooling 200 matches the shape and size of the sealing ring sample 100, and also matches the shape and size of the cross section of the sealing ring that meets the preset compression rate. The sealing ring sample 100 can be pressed on the tooling 200.

[0074] Furthermore, the sealing ring sample 100 is fixed and compressed on the tooling 200, and the sealing ring sample 100 and the tooling 200 surround and form a closed cavity 300; wherein the cross section of the sealing ring sample 100 after compression is similar to that of Figure 2 The shape and size of the cross section of the sealing ring that meets the preset compression rate are consistent after being rotated 180°.

[0075] The cross-section of the sealing ring sample 100 after compression is consistent with the shape and size of the cross-section of the sealing ring that meets the preset compression rate after being rotated 180°, which is equivalent to flipping the inner ring extrusion surface of the annular sealing ring sample 100 to the outer ring extrusion surface, and the outer ring extrusion surface is naturally flipped to the inner ring extrusion surface.

[0076] In one implementation of this embodiment, the cross section of the sealing ring that meets the preset compression rate is as follows: Figure 2 The trapezoidal cross section shows the load condition of the integrated battery-body structure of the vehicle. The left side of the trapezoid is close to the outside of the vehicle, and the right side of the trapezoid is close to the inside of the vehicle. H represents the center height of the trapezoidal cross section, and W represents the length of the trapezoidal cross section. The cross section of the compressed sealing ring sample 100 is Figure 1 The trapezoid shown in Figure 2 The shape and size of the cross section of the sealing ring that meets the preset compression rate after rotating 180° are consistent. Figure 1The left side of the trapezoidal seal ring sample 100 (i.e., the outside of the test sample 10) is close to the outside of the vehicle, and the right side of the trapezoidal seal ring sample 100 (i.e., the inside of the cavity 300) is close to the inside of the vehicle. This is equivalent to turning the seal ring sample inside out, so that the inside of the cavity 300 of the seal ring sample 100 simulates the water inflow environment outside the vehicle of the battery-body integrated structure, and the outside of the seal ring sample 100 corresponds to the water leakage area inside the vehicle of the battery-body integrated structure. Therefore, water can be injected into the cavity 300 of the test sample 10, and the sealing of the test sample 10, i.e., the battery-body integrated structure, can be detected by observing whether there is water seepage outside the test sample 10. In this way, it is possible to directly observe and judge whether there is a water leakage point in the battery-body integrated structure under the water inflow environment outside the vehicle, and it is not easy to make a misjudgment.

[0077] In addition, since the length of the sealing ring sample 100 is less than the length of the sealing ring of the battery-body integrated structure, the tooling 200 only simulates the sealing surface of the battery-body integrated structure, rather than the entire battery-body integrated structure. In this way, the test sample 10 removes the redundant structure in the battery-body integrated structure, which can not only save development costs, but also prevent various practical scenario problems in advance, and shorten the development cycle. The smaller test sample 10 replaces the entire battery-body integrated structure, which also saves the R&D cost of the bench experiment.

[0078] In one implementation of this embodiment, Figure 1 As shown, the tooling 200 includes an upper portion 210 and a lower portion 220 that are detachably fixedly connected, the sealing ring sample 100 is fixed and compressed between the upper portion 210 and the lower portion 220 , and the upper portion 210 , the lower portion 220 and the sealing ring sample 100 form a cavity 300 .

[0079] In this embodiment, the detachable fixed connection includes but is not limited to the following Figure 3 and Figure 4 Bolted connection shown.

[0080] In one implementation of this embodiment, Figure 3 As shown, the tooling 200 also includes a gasket 230, which is arranged between the upper part 210 and the lower part 220 and is located in the cavity 300. The thickness of the gasket 230 is set corresponding to the size chain distribution range of the sealing surface of the battery-body integrated structure. The size chain distribution range is one of ±3σ, ±4σ and ±5σ, and σ is the standard deviation of the normal distribution.

[0081] In this embodiment, the dimension chain distribution range of the sealing surface of the battery-body integrated structure mainly refers to the gap tolerance of the sealing surface of the battery-body integrated structure, which corresponds to the gap tolerance between the upper part 210 and the lower part 220 of the tooling 200. When the dimension chain is shorter, the tolerance range is small, and when the dimension chain is longer, the tolerance range is large.

[0082] The distribution range of the dimension chain is one of ±3σ, ±4σ and ±5σ. The selection method of the dimension chain distribution range includes: determining the importance according to the functional level of the part, and then determining the specific dimension chain distribution range according to the importance. For example, if it is very important and involves life safety, the selected dimension chain distribution range is ±5σ, if it is very important and cannot be allowed to fail, the selected dimension chain distribution range is ±4σ, and the selected dimension chain distribution range is ±3σ for general importance and no special requirements.

[0083] The specific setting position of the gasket 230 is as follows Figure 3 As shown, the thickness of the gasket 230 is equal to the tolerance value of the inner gap between the upper part 210 and the lower part 220. For example, the distribution range of the dimension chain between the upper part 210 and the lower part 220 is determined to be ±3σ, the specific tolerance value is ±3mm, and the ideal gap is 10mm. When the tolerance is the upper deviation +3mm, it is necessary to consider the sealing performance of the under-compression of the sealing ring sample 100, and the gap of the sealing ring sample 100 is changed from the ideal 10mm to 13mm to reduce the compression of the sealing ring sample 100. In this way, the thickness of the gasket 230 in the tooling 200 is 3mm, that is, a gasket 230 with a thickness of 3mm can be used.

[0084] In one implementation of this embodiment, Figure 4 and Figure 5 As shown, the tooling 200 further includes a groove 240 , which is disposed on the surface of the tooling 200 that contacts the sealing ring sample 100 , and the groove 240 simulates the groove of the sealing surface of the battery-body integrated structure.

[0085] Since the lower body of the battery-body integrated structure is made of multiple sheet metals, there are discontinuous features such as step surfaces at the sheet metal joints to form grooves. Compared with smooth surfaces, it is easier for water to seep in the grooves. Therefore, grooves 240 are set on the surface where the tooling 200 contacts the sealing ring sample 100, and grooves 240 simulate the grooves of the sealing surface of the battery-body integrated structure, so that this process risk on the lower body can be identified in advance and the process optimization can be guided.

[0086] In this embodiment, the upper part 210 can be set corresponding to the lower body structure in the sealing surface of the battery-body integrated structure, and the lower part 220 can be set corresponding to the upper cover structure of the battery in the sealing surface of the battery-body integrated structure. Figure 4 and Figure 5The upper part 210 of the tooling 200 shown is on the surface in contact with the sealing ring sample 100. The groove 240 can also be set on the surface in contact with the sealing ring sample 100 of the lower part 220 of the tooling 200. The groove 240 simulates the groove of the sealing surface of the battery-body integrated structure, that is, the middle groove 240 is consistent with the structural size of the groove in the battery-body integrated structure, and the number can be set according to actual conditions, and can be consistent or inconsistent, and this embodiment does not impose specific restrictions on this.

[0087] In one implementation of this embodiment, Figure 1 and Figure 6 As shown, the tool 200 also includes a positioning portion 250 for positioning the sealing ring sample 100.

[0088] In this embodiment, if Figure 6 As shown, the positioning portion 250 can be specifically arranged on the surface where the lower portion 220 of the tooling 200 contacts the sealing ring sample 100. Figure 1 and Figure 6 The specific structure of the positioning portion 250 can be a protrusion located at the outer periphery of the surface of the lower portion 220 that contacts the sealing ring sample 100 and extending toward the sealing ring sample 100. When the sealing ring sample 100 is fixed on the tooling 200, it contacts and is located inside the protrusion, which can play a role in positioning the sealing ring sample 100. The cross section of the protrusion can be as follows: Figure 1 The specific structure of the positioning part 250 can also be other structures, and the specific setting position can also be other positions on the tooling 200, as long as it can play a role in positioning the sealing ring sample 100, and this embodiment will not be described in detail.

[0089] Since the position of the sealing ring sample 100 on the test sample 10 affects the sealing performance of the test sample 10, the positioning portion 250 is provided to limit the laying area of ​​the sealing ring sample 100 and improve the consistency of the experimental results.

[0090] In one implementation of this embodiment, Figure 1 As shown, the tool 200 also includes a pressure relief valve 260, which is connected to the cavity 300. When the cavity 300 is pressurized and filled with water for sealing test, the gas inside the cavity 300 is prevented from affecting the observation of water penetration and the sealing judgment of the test sample 10.

[0091] In this embodiment, the upper part 210 and the lower part 220 of the tooling 200 are detachably fixedly connected by four studs as an example, and the assembly method of the test sample 10 is described. The specific assembly method includes: firstly, using the positioning part 250 to stick the sealing ring sample 100 on the lower part 220 of the tooling 200, and then passing the four studs into the openings of the upper part 210, and then respectively putting the gaskets 230 on the lower part 220 of the tooling 200. Figure 3 On the four studs shown ( Figure 3 Only two studs are shown in the figure), four studs pass through the opening of the lower part 220, and the bolts are tightened to make the trapezoidal cross-section shape of the sealing ring sample 100 consistent with the shape of the trapezoidal cross-section of the sealing ring in the battery-body integrated structure in the simulation software after rotating 180°, and the assembly of the test sample 10 is completed. The lower part 220 of the tooling 200 corresponds to the upper cover of the battery, and the upper part 210 of the tooling 200 corresponds to the lower body. The material and cross-sectional dimensions of the sealing ring sample 100 are consistent with the selection of the whole vehicle, and the actual length can be reduced. In a specific embodiment, the size of the test sample 10 is limited to 120mm*120mm*60mm, and the manufacturing accuracy of each size of the tooling 200 is required to be <0.05mm, and the sealing ring sample 100 is continuous throughout the circle.

[0092] Example 2

[0093] In the process of vehicle development, objective data is generally needed to verify the feasibility of the design. The main sealing verification experiments are: part-level sealing verification experiment: the sealing ring material meets the compression rate value of normal temperature and durable IPX7 waterproof level. The current standard for achieving IPX7 waterproof level is to place the waterproof product that has undergone the sealing experiment in 1m water depth, soak it for 30 minutes, and then use it normally without water ingress; system-level sealing verification experiment: for example, the waterproof sealing experiment of the vehicle body at IPX7 level; body-in-white sealing verification experiment: meet the airtightness index, and under a certain background pressure, the leakage is less than a certain value; vehicle-level sealing verification experiment: water wading test is carried out on the vehicle before durability, after durability, and after weathering.

[0094] The sealing test conducted by the sealing test equipment of the battery-body integrated structure belongs to the system-level sealing verification test, that is, to verify whether the waterproof level of the sealing surface of the battery-body integrated structure reaches the IPX7 level, that is, to immerse the battery-body integrated structure. However, in the process of the sealing test of the battery-body integrated structure, the battery-body integrated structure is immersed and then the internal structure is opened for observation. The operation is repeated, and when the amount of water entering the internal structure is large, it is difficult to accurately identify the leakage point, which is prone to misjudgment, thus affecting the accuracy of the test results and the safety of the vehicle. In addition, the current research and development cost of the sealing test bench experiment of the battery-body integrated structure is relatively high. Once the experimental results show that the battery-body integrated structure has a leakage, it will also lead to the problem of extended development cycle.

[0095] like Figure 7 and Figure 8 As shown, in order to solve the above technical problems, the present invention also provides a sealing test device for a battery-body integrated structure, comprising: the test sample 10 in Example 1; and a pressurizing device 20, the pressurizing device 20 is configured to: pressurize and inject water into a closed cavity 300 formed by a sealing ring sample 100 and a tooling 200 of the test sample 10 to detect the sealing of the test sample 10.

[0096] Water is injected into the cavity 300 of the test sample 10 through the pressurizing device 20, and whether there is water seepage on the outside of the test sample 10 is observed to detect the sealing of the test sample 10, i.e., the battery-body integrated structure. In this way, it is possible to directly observe and judge whether there are water leaks in the battery-body integrated structure under the water inflow environment outside the vehicle, and it is not easy to make a misjudgment. Since the test sample 10 removes the redundant structure in the battery-body integrated structure, it can not only save development costs, but also prevent various practical scenario problems in advance, and shorten the development cycle. The smaller test sample 10 replaces the entire battery-body integrated structure, which also saves the research and development costs of bench experiments.

[0097] In one implementation of this embodiment, a water injection mark corresponding to a preset waterproof level is provided on the pressurizing device 20 , and the pressurizing device 20 pressurizes and injects water into the cavity 300 according to the preset waterproof level to detect the waterproof level of the test sample 10 .

[0098] By setting a water injection mark corresponding to the preset waterproof level of the test sample 10 on the pressurizing device 20, water can be directly injected according to the position of the water injection mark during the sealing test of the battery-body integrated structure. Thereafter, water is injected into the closed cavity 300 formed by the sealing ring sample 100 and the tooling 200 of the test sample 10 through the pressurizing device 20, so as to test whether the waterproof level of the test sample 10 meets the requirements.

[0099] The specific water injection mark position can be marked according to different waterproof levels through experiments, and this embodiment does not impose specific restrictions on this. For example, experiments show that the water injection mark position corresponding to the IPX7 waterproof level can be 1m above the pressure point, and the pressure point can be set as follows Figure 7 The topmost point of the test sample 10 shown is the horizontal position of the water inlet, which ensures that the pressure below the water horizontal line at the pressure point is greater than 10kpa, that is, the height difference from the pressure point to the water injection mark position is ≥1m.

[0100] In one implementation of this embodiment, Figure 7 As shown, the pressurizing device 20 includes a water tank 21, a connecting pipe 22 and a valve 23. The connecting pipe 22 is arranged between the water tank 21 and the test sample 10, and is used to connect the water tank 21 and the test sample 10. The valve 23 is arranged on the connecting pipe 22, and the water filling mark is arranged on the water tank 21. When the valve 23 is closed, water is filled into the water tank 21 according to the water filling mark to realize external pressurization. After the test sample 10 is installed, the valve 23 can be opened to fill water into the test sample 10, and the height difference between the water inlet of the test sample 10 and the liquid level of the water tank 21 is controlled to meet the loading pressure required by the standard, so as to perform the sealing test of the test sample 10.

[0101] In one implementation of this embodiment, the sealing test equipment of the battery-body integrated structure includes multiple test samples 10 in Example 1, and the multiple test samples 10 can be connected to the water tank 21 through multiple connecting pipes 22. The multiple connecting pipes 22 can control the connection and disconnection between the water tank 21 and the multiple test samples 10 through a valve 23.

[0102] In this way, when there are multiple test samples 10, the valve 23 can be closed before disassembly and assembly. Since the length of the connecting pipe 22 between the valve 23 and the multiple test samples 10 is short, the amount of water discharged by disassembly and assembly is small. When the water tank 21 needs to be drained, it can be achieved by simply removing the multiple test samples 10 and then opening the valve 23.

[0103] Example 3

[0104] Next, refer to the attached Fig. 9 and Fig.10 , the structure and advantages of the sealing test equipment of the battery-body integrated structure provided by the present invention are described in detail.

[0105] The present invention also provides a method for testing the sealing performance of a battery-body integrated structure, wherein the battery-body integrated structure comprises a lower body, a battery and a sealing ring, wherein a sealing surface is provided between the lower body and the upper cover of the battery, and the sealing ring is pressed into the sealing surface; Fig. 9 As shown, the sealing test method includes:

[0106] S1: Establish a whole vehicle simulation model, the whole vehicle simulation model includes a battery body integrated structure simulation model that simulates the battery body integrated structure, and obtain the cross section of the sealing ring of the battery body integrated structure simulation model that meets the preset compression rate. Then execute step S2.

[0107] In this embodiment, finite element calculation software such as LS-DYNA can be used to establish a whole vehicle simulation model. The battery-body integrated structure simulation model that simulates the battery-body integrated structure is consistent with the structure and material of the actual battery-body integrated structure. The battery-body integrated structure includes a lower body, a battery, and a sealing ring, and the battery-body integrated structure simulation model also includes a lower body, a battery, and a sealing ring.

[0108] The cross section of the sealing ring that meets the preset compression rate in the battery-body integrated structure simulation model can reflect the load condition of the battery-body integrated structure. In one implementation of the present embodiment, in step S1, the preset compression rate is 10% to 30%, that is, the cross section of the sealing ring that meets the preset compression rate is the cross section with the worst deformation of the sealing surface in the battery-body integrated structure simulation model. It should be noted that in the present implementation, since the sealing ring in the whole vehicle simulation model is a full circle, when the simulated load is loaded on the whole vehicle, the compression rates of different positions of the same circle of sealing ring are different. Different compression rates indicate different underpressure states of the sealing ring. The underpressure area is a location prone to leakage. The preset compression rate is 10% to 30%, specifically, it can be 10%, 15%, 20% and 30% four underpressure states. The cross section of the sealing ring that meets the preset compression rate is obtained. Specifically, the corresponding can be obtained as follows Figure 2 The center height H shown is measured as a trapezoidal section of 9mm, 8.5mm, 8mm, and 7mm, while the length W is not considered in this embodiment.

[0109] In one implementation of this embodiment, in step S1, a cross section of a sealing ring that satisfies a preset compression rate of a battery-body integrated structure simulation model under dynamic conditions is obtained, and the dynamic conditions include pedaling conditions, torsion conditions, bending conditions, and assembly conditions.

[0110] It should be noted that during the vehicle dynamic test, the corresponding parameters under different dynamic conditions, such as foot-stepping condition, torsion condition, bending condition and assembly condition, are extracted respectively. The foot-stepping condition is when a passenger steps on the battery when getting on the vehicle, the torsion condition is when the vehicle is driving over a bumpy road, the bending condition is when the vehicle is fully loaded over a bump or square pit, and the assembly condition is when the battery pack is hung on the vehicle body during the factory assembly process. The corresponding parameters are then loaded into the whole vehicle simulation model to obtain the information of the sealing surface under dynamic conditions.

[0111] Based on dynamic working conditions, that is, simulating actual user scenarios such as stepping on, twisting, bending and assembly, the cross-section of the sealing ring that meets the preset compression rate is obtained. This can reflect the deformation of the lower body and the upper cover of the battery in actual user scenarios, identify the risks of actual user scenarios, and thus improve the practicality of the sealing test results.

[0112] In one implementation of the present embodiment, before step S2, it also includes: S1': determining the size chain distribution range of the sealing surface of the battery-body integrated structure, the size chain distribution range is one of ±3σ, ±4σ and ±5σ, σ is the standard deviation of the normal distribution. In step S2, making a tooling for simulating the sealing surface of the battery-body integrated structure also includes: making the tooling according to the second parameter and the size chain distribution range. The tooling also includes a gasket, which is arranged between the upper part and the lower part and is located in the cavity, and the thickness of the gasket is set corresponding to the determined size chain distribution range.

[0113] The size chain distribution range of the sealing surface corresponding to different sealing requirements of the tooling is different. According to the size chain distribution range of the sealing surface of the battery-body integrated structure, the thickness of the gasket set between the upper and lower parts is adjusted to meet the sealing performance of the test sample, i.e., the battery-body integrated structure, under different sealing requirements of the tooling.

[0114] S2: Make a sealing ring sample that simulates the battery-body integrated structure and is shorter than the sealing ring, and make a tooling that simulates the sealing surface of the battery-body integrated structure and matches the sealing ring sample and the cross section of the sealing ring that meets the preset compression rate. Fix and compress the sealing ring sample on the tooling, so that the cross section of the compressed sealing ring sample in the test sample is consistent with the shape and size of the cross section of the sealing ring that meets the preset compression rate after rotating 180°, so as to form a test sample, and the sealing ring sample and the tooling form a closed cavity. Then execute step S3.

[0115] In one implementation of this embodiment, in step S2, making a sealing ring sample simulating a sealing ring of a battery-body integrated structure includes: obtaining a first parameter of the sealing ring of the battery-body integrated structure, and making a sealing ring sample according to the first parameter; wherein the first parameter includes the material and cross-sectional dimensions of the sealing ring of the battery-body integrated structure. In this way, the performance of the sealing ring sample can be closest to the performance of the sealing ring of the battery-body integrated structure, thereby improving the accuracy of the sealing test results.

[0116] The material of the sealing ring of the battery-body integrated structure can be silicone foam or polyurethane foam material.

[0117] In one implementation of the present embodiment, in step S2, a tooling is produced to simulate the sealing surface of the battery-body integrated structure, including obtaining second parameters of the sealing surface of the battery-body integrated structure and producing the tooling according to the second parameters; wherein the second parameters include parameters of the lower body in the battery-body integrated structure and parameters of the upper cover of the battery.

[0118] The tooling is made according to the second parameter and matches the cross section of the sealing ring sample and the sealing ring that meets the preset compression rate, so that the cross section of the sealing ring sample after compression in the test sample can be consistent with the cross section of the sealing ring that meets the preset compression rate after rotating 180°. This can make the performance of the tooling closest to the performance of the sealing surface of the battery-body integrated structure, and improve the accuracy of the sealing test results.

[0119] In one implementation of this embodiment, in step S2, the tooling includes an upper portion and a lower portion that are detachably fixedly connected, the sealing ring sample is fixed and compressed between the upper portion and the lower portion, and the upper portion, the lower portion and the sealing ring sample form a cavity.

[0120] The upper part is manufactured according to the parameters of the lower body of the battery-body integrated structure. The parameters of the lower body include the structure of the side of the lower body close to the sealing surface. The structure includes a groove, and the side of the upper part close to the sealing ring sample matches the side of the cross section of the sealing ring close to the lower body. The lower part is manufactured according to the parameters of the upper cover of the battery of the battery-body integrated structure. The parameters of the upper cover of the battery include the structure of the side of the upper cover of the battery close to the sealing surface, and the side of the lower part close to the sealing ring sample matches the side of the cross section of the sealing ring close to the upper cover of the battery.

[0121] The upper and lower parts of the tooling are made according to the parameters of the lower body of the battery-body integrated structure and the parameters of the upper cover of the battery, respectively, and the side of the upper part close to the sealing ring sample matches the side of the sealing ring section close to the lower body, and the side of the lower part close to the sealing ring sample matches the side of the sealing ring section close to the upper cover of the battery, so that after the upper and lower parts are fixedly connected, the cross-section of the compressed sealing ring sample can be rotated 180° to the shape and size of the cross-section of the sealing ring that meets the preset compression rate. For example, if the cross-section of the sealing ring that meets the preset compression rate is as follows Figure 2 The upper side of the trapezoidal shape near the seal ring sample and the lower side of the trapezoidal shape near the seal ring sample match the upper and lower bevels of the trapezoidal cross section. The inclination angles of the upper side of the tooling near the seal ring sample and the lower side of the tooling near the seal ring sample should be respectively as shown in the figure. Figure 2 The upper and lower hypotenuses of the new trapezoid formed by rotating the trapezoidal cross section by 180° have the same inclination angle.

[0122] In one implementation of this embodiment, Fig.10 As shown, before step S3, it also includes: S2': subjecting the test sample to a durability test, and then executing step S3; wherein the durability test includes a high temperature and high humidity test, a cold and hot shock test, and a continuous high temperature and salt spray test. The high temperature and high humidity test requires a temperature of 85°C and a relative humidity of 85%; the cold temperature in the cold and hot shock test is -45°C and the hot temperature is 80°C; and a salt spray box with a temperature of 110°C is provided in the continuous high temperature and salt spray test.

[0123] Considering that the sealing ring may be subject to material aging and permanent deformation under actual circumstances, the test samples are subjected to durability tests including high temperature and high humidity tests, hot and cold shock tests, and continuous high temperature and salt spray tests, and then pressurized water is injected into the cavity to detect the sealing of the test samples. This can detect the sealing of the battery-body integrated structure under actual circumstances, thereby improving the practicality of the sealing test results.

[0124] In this embodiment, before executing step S3, a dimensional review is required. Specifically, the sealing surface accuracy of the test sample can be detected by three-coordinate measurement to ensure that the data of the test sample is consistent with the battery-body integrated structure.

[0125] S3: Pressurize the cavity with water to detect the sealing of the test sample.

[0126] In one implementation of this embodiment, in step S3, pressurizing water into the cavity to detect the sealing of the test sample includes: setting a pressurizing device, pressurizing water into the cavity according to the preset waterproof level through the pressurizing device to detect the waterproof level of the test sample, and the pressurizing device is provided with a water injection mark corresponding to the preset waterproof level. During the sealing test of the battery-body integrated structure, water can be directly injected according to the position of the water injection mark, and then water is injected into the closed cavity formed by the sealing ring sample and the tooling of the test sample through the pressurizing device, so as to test whether the waterproof level of the test sample meets the requirements.

[0127] The specific setting position of the water injection mark corresponding to the preset waterproof level and the specific structure of the pressurizing device are as described in Example 2, and this embodiment will not be described in detail.

[0128] Since the sealing ring sample is fixed and compressed on the tooling, and the cross-section of the compressed sealing ring sample in the test sample is consistent with the shape and size of the cross-section of the sealing ring that meets the preset compression rate after rotating 180°, the cavity is pressurized and water is injected, that is, the inside of the tooling corresponds to the water inflow environment outside the vehicle, and the outside of the tooling corresponds to the water leakage area inside the vehicle. During the experiment, it is possible to directly observe and judge whether there is a leak in the water inflow environment outside the vehicle, and it is not easy to make a misjudgment. In addition, except for the redundant structure in the battery-body integrated structure, only the key structure in the battery-body integrated structure is simulated, which can not only save development costs, but also prevent various actual scenario problems in advance without waiting until the whole vehicle manufacturing stage to open the mold and make the real battery and body, which can shorten the development cycle. And the smaller test sample replaces the entire battery-body integrated structure, which also saves the research and development cost of the bench experiment.

[0129] The above is an explanation of the implementation mode of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation mode. On the contrary, the purpose of introducing the invention in conjunction with the implementation mode is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, many specific details will be included in the above description. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the key points of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0130] It should be noted that in this specification, similar reference numerals and letters denote similar items in the above-mentioned drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0131] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0132] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A test sample of a battery-body integrated structure, the battery-body integrated structure comprising a lower body, a battery and a sealing ring, a sealing surface between the lower body and the upper cover of the battery, the sealing ring being pressed into the sealing surface; It is characterized in that The test sample simulates the battery-body integrated structure and includes: A sealing ring sample, wherein the sealing ring sample is configured to simulate a sealing ring of the battery-body integrated structure and has a length shorter than the sealing ring; A tooling, wherein the tooling is configured to: simulate the sealing surface of the battery-body integrated structure and match the cross-section of the sealing ring that meets a preset compression rate in the sealing ring sample and the simulation model of the battery-body integrated structure; and The sealing ring sample is fixed and compressed on the tooling, and the sealing ring sample and the tooling form a closed cavity around it; wherein, after compression, the cross-section of the sealing ring sample is consistent with the shape and size of the cross-section of the sealing ring that meets the preset compression rate after rotating 180°.

2. The test specimen according to claim 1, It is characterized in that The tooling comprises an upper part and a lower part which are detachably fixedly connected, the sealing ring sample is fixed and compressed between the upper part and the lower part, and the upper part, the lower part and the sealing ring sample form the cavity.

3. The test specimen according to claim 2, It is characterized in that The tooling also includes a gasket, which is arranged between the upper part and the lower part and located in the cavity, and the thickness of the gasket is set corresponding to the size chain distribution range of the sealing surface of the battery-body integrated structure.

4. The test specimen according to any one of claims 1 to 3, It is characterized in that The tooling also includes a groove, which is arranged on the surface of the tooling that contacts the sealing ring sample, and the groove simulates the groove of the sealing surface of the battery-body integrated structure.

5. The test specimen according to any one of claims 1 to 3, It is characterized in that The tool also includes a positioning portion for positioning the sealing ring sample.

6. The test sample according to any one of claims 1 to 3, It is characterized in that The tooling also includes a pressure relief valve, which is communicated with the cavity.

7. A sealing test device for the battery-body integrated structure, It is characterized in that include: The test sample according to any one of claims 1 to 6; as well as A pressurizing device is configured to pressurize and inject water into a closed cavity formed by the sealing ring sample and the tooling of the test sample to detect the sealing performance of the test sample.

8. The sealing test equipment for the battery-body integrated structure as claimed in claim 7, It is characterized in that The pressurizing device is provided with a water injection mark corresponding to a preset waterproof level, and the pressurizing device pressurizes and injects water into the cavity according to the preset waterproof level to detect the waterproof level of the test sample.

9. The sealing test equipment for the battery-body integrated structure as claimed in claim 8, It is characterized in that The pressurizing device includes a water tank, a connecting pipe and a valve; in The connecting pipe is arranged between the water tank and the test sample, and is used to connect the water tank and the test sample; the valve is arranged on the connecting pipe; and the water filling mark is arranged on the water tank.

10. A method for testing the sealing performance of a battery-body integrated structure, the battery-body integrated structure comprising a lower body, a battery and a sealing ring, a sealing surface being provided between the lower body and an upper cover of the battery, and the sealing ring being pressed into the sealing surface; It is characterized in that The sealing test method comprises: S1: Establishing a whole vehicle simulation model, the whole vehicle simulation model includes a battery body integrated structure simulation model simulating the battery body integrated structure, and obtaining a section of a sealing ring of the battery body integrated structure simulation model that meets a preset compression rate; S2: manufacturing a sealing ring sample simulating the sealing ring of the battery-body integrated structure and having a length shorter than the sealing ring, and manufacturing a tooling that simulates the sealing surface of the battery-body integrated structure and matches the sealing ring sample and the cross section of the sealing ring that meets the preset compression rate; The sealing ring sample is fixed and compressed on the tooling, so that the cross section of the sealing ring sample after compression in the test sample is consistent with the shape and size of the cross section of the sealing ring that meets the preset compression rate after rotation by 180°, so as to form a test sample, and the sealing ring sample and the tooling form a closed cavity; S3: Pressurizing the cavity with water to detect the sealing performance of the test sample.

11. The sealing test method of the battery-body integrated structure according to claim 10, It is characterized in that In the step S1, a cross section of the sealing ring that satisfies the preset compression rate of the battery-body integrated structure simulation model under dynamic conditions is obtained, and the dynamic conditions include pedaling conditions, torsion conditions, bending conditions, and assembly conditions.

12. The sealing test method of the battery-body integrated structure according to claim 10, It is characterized in that Before step S3, the method further includes: S2': subjecting the test sample to a durability test, and then executing step S3, wherein the durability test includes a high temperature and high humidity test, a hot and cold shock test, and a continuous high temperature and salt spray test.

13. The sealing test method of the battery-body integrated structure according to claim 10, It is characterized in that In the step S2, making the sealing ring sample of the sealing ring simulating the battery-body integrated structure includes: obtaining the first parameters of the sealing ring of the battery-body integrated structure, and making the sealing ring sample according to the first parameters; wherein the first parameters include the material and cross-sectional dimensions of the sealing ring of the battery-body integrated structure.

14. The sealing test method of the battery-body integrated structure according to claim 13, It is characterized in that In the step S2, a tooling is produced to simulate the sealing surface of the battery-body integrated structure, including obtaining second parameters of the sealing surface of the battery-body integrated structure and producing the tooling according to the second parameters; wherein the second parameters include parameters of the lower body in the battery-body integrated structure and parameters of the upper cover of the battery.

15. The sealing test method of the battery-body integrated structure according to claim 14, It is characterized in that In step S2, the tooling includes an upper part and a lower part that are detachably fixedly connected, the sealing ring sample is fixed and compressed between the upper part and the lower part, and the upper part, the lower part and the sealing ring sample form the cavity; The upper part is manufactured according to the parameters of the lower body of the battery-body integrated structure, wherein the parameters of the lower body include a structure of a side of the lower body close to the sealing surface, wherein the structure includes a groove, and a side of the upper part close to the sealing ring sample is matched with an edge of the cross section of the sealing ring close to the lower body; The lower part is manufactured according to the parameters of the upper cover of the battery of the battery-body integrated structure, the parameters of the upper cover of the battery include the structure of the side of the upper cover of the battery close to the sealing surface, and the side of the lower part close to the sealing ring sample is matched with the edge of the cross section of the sealing ring close to the upper cover of the battery.

16. The sealing test method of the battery-body integrated structure according to claim 15, It is characterized in that Before step S2, the following further includes: S1': determining the size chain distribution range of the sealing surface of the battery-body integrated structure; In the step S2, manufacturing a tool for simulating the sealing surface of the battery-body integrated structure further includes: manufacturing the tool according to the second parameter and the dimensional chain distribution range; The tooling also includes a gasket, which is arranged between the upper part and the lower part and located in the cavity, and the thickness of the gasket is set corresponding to the determined distribution range of the dimension chain.

17. The sealing test method of the battery-body integrated structure according to any one of claims 10 to 16, It is characterized in that In the step S3, water is pressurized into the cavity to detect the sealing of the test sample, including: a pressurizing device is set up, and water is pressurized into the cavity according to a preset waterproof level by the pressurizing device to detect the waterproof level of the test sample, and a water injection mark corresponding to the preset waterproof level is provided on the pressurizing device.

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