New energy vehicle bottom battery pack inclined impact test system and method

Abstract

The invention discloses a new energy vehicle bottom battery pack inclined impact test system and method, and the system comprises a new energy vehicle and a track, the bottom of the new energy vehicle is loaded with a battery pack, the new energy vehicle is installed on the track, and the new energy vehicle is configured to be capable of moving along the laying direction of the track; the impact simulation piece is installed on the ejection assembly, the ejection assembly is installed on the track, and the ejection assembly is configured to be capable of releasing the impact simulation piece so that the impact simulation piece can impact the moving battery pack; the adjusting assembly is installed on the track, the ejection assembly is installed on the adjusting assembly, and the adjusting assembly is configured to be capable of adjusting the angle of releasing the impact simulation piece by the ejection assembly; the new energy vehicle, the ejection assembly and the adjusting assembly can simulate the actual working condition of high-speed driving of the vehicle, a real and comprehensive impact test object is provided for the impact simulation piece, the real and effective test result is ensured, and the actual impact resistance of the battery pack can be accurately reflected.

Description

Technical Field

[0001] The present invention relates to the field of vehicle collision tests, and particularly to an inclined impact test system and method for a bottom battery pack of a new energy vehicle. Background Art

[0002] With the continuous progress of technology and the improvement of consumers' environmental awareness, the market share of new energy vehicles has been continuously climbing and has become the mainstream trend of the future development of the automotive industry. New energy vehicles, with their many advantages such as zero or low emissions, low noise, and high efficiency, not only provide an effective way to alleviate the energy crisis and environmental pollution problems, but also bring a brand-new travel experience to consumers; as the core component of new energy vehicles, the battery pack not only provides the electrical energy required for vehicle driving, but also the quality of its performance is directly related to the vehicle's power performance, cruising range, and overall safety. During the actual use of new energy vehicles, the battery pack faces complex, variable, and severe external environmental challenges. For example, when the vehicle is driving, there may be various foreign objects of different sizes, shapes, and materials on the road surface, such as stones, metal fragments, tree branches, etc. Under the action of the strong airflow generated by the vehicle's high-speed driving and their own inertia, these foreign objects will fly up at a high speed and a specific angle, directly impacting the battery pack at the bottom of the vehicle, resulting in the rupture of the battery pack shell and damage to the internal battery cells, and further triggering serious safety accidents such as battery short circuits, fires, and even explosions. These safety accidents not only pose a direct threat to the life and property safety of users, but also may cause the public's concern about the safety of new energy vehicles, hindering the further promotion and development of the new energy vehicle industry. Therefore, battery safety performance testing technology is becoming the focus of industry attention.

[0003] However, most of the existing battery safety performance tests are based on standardized simulated working conditions, and the deficiencies are as follows: only single-direction impacts are involved, ignoring the situation of foreign objects impacting the battery pack at different angles; there are large deviations between the set impact speeds and foreign object types and the actual road conditions, resulting in the test results being unable to accurately reflect the impact resistance performance of the battery pack in actual use; the test object used is a static battery pack, and it is impossible to conduct impact tests on a battery pack that is driving at high speed, making it difficult to truly and comprehensively restore the complex and variable actual working condition of the vehicle encountering foreign objects splashing on the road surface during high-speed driving. Summary of the Invention

[0004] The purpose of the present invention is to provide an inclined impact test system and method for a bottom battery pack of a new energy vehicle, so as to solve the problems in the existing battery safety performance testing technology that only single-direction impacts are involved, there are large deviations between the impact speeds and foreign object types and the actual road conditions, and the test object is a static battery pack and it is impossible to test a driving battery pack, making it difficult to truly and comprehensively restore the actual working condition during high-speed driving, resulting in the test results being unable to accurately reflect the actual impact resistance performance of the battery pack.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A bottom battery pack oblique impact test system for new energy vehicles, comprising:

[0007] A new energy vehicle and a track, with a battery pack loaded at the bottom of the new energy vehicle. The new energy vehicle is installed on the track and is configured to be able to move along the laying direction of the track;

[0008] An impact simulation member and an ejection assembly. The impact simulation member is installed on the ejection assembly, and the ejection assembly is installed on the track. The ejection assembly is configured to be able to release the impact simulation member so that the impact simulation member impacts the moving battery pack;

[0009] An adjustment assembly. The adjustment assembly is installed on the track, and the ejection assembly is installed on the adjustment assembly. The adjustment assembly is configured to be able to adjust the angle at which the ejection assembly releases the impact simulation member.

[0010] According to the above technical means, through the new energy vehicle and the track, the new energy vehicle with a battery pack loaded at the bottom can simulate the actual working conditions of the vehicle running at high speed, thereby providing a real and comprehensive impact test object for the impact simulation member, ensuring the authenticity and effectiveness of the test results, and being able to accurately reflect the actual impact resistance performance of the battery pack; by the ejection assembly releasing the impact simulation member at a set speed to impact the moving battery pack, a dynamic impact scenario more fitting for the vehicle encountering foreign object splashing during high-speed driving is simulated. At the same time, by the adjustment assembly flexibly adjusting the angle at which the ejection assembly releases the impact simulation member, it makes up for the defect of the existing technology that can only impact in a single direction, has high flexibility, and can more realistically and comprehensively restore the complex and changeable actual working conditions of the vehicle encountering foreign object splashing on the road surface during high-speed driving. Furthermore, the test results can more accurately reflect the impact resistance performance of the battery pack in actual use, providing strong support for new energy enterprises to accurately detect the strength of the battery pack and scientifically evaluate the vehicle safety risk level, and strongly promoting the development of new energy vehicle safety performance detection technology.

[0011] Further, the ejection assembly includes a spring and a mounting post. One end of the spring is connected to the adjustment assembly, and the other end is connected to one end of the mounting post. An installation groove is formed at the other end of the mounting post, and the impact simulation member can be placed in the installation groove. The mounting post is configured to be able to move along a first direction and a second direction;

[0012] When the mounting post moves along the first direction, the spring is compressed or stretched, and the impact simulation member is located in the installation groove; when the mounting post moves along the second direction, the spring resets, and the impact simulation member disengages from the installation groove to be released.

[0013] According to the above technical means, through the cooperation of the spring and the mounting post, a power source for catapulting the impact simulation piece is provided. The magnitude of the catapulting force can be adjusted by controlling the degree of compression or tension of the spring, so as to realize the release of the impact simulation piece at a set speed. Specifically, when the mounting post moves along the first direction by an external force, the spring is compressed or stretched to a preset degree to store energy for subsequent catapulting. The impact simulation piece can be stably placed in the mounting groove, ensuring the reliable fixation of the impact simulation piece in the preparation stage and avoiding premature detachment from affecting the test results. When conducting the impact test, the external force driving the mounting post is cancelled, and the spring resets, driving the mounting post to move along the second direction. Thus, under the action of inertia, the impact simulation piece is released and catapulted accurately and quickly to impact the moving battery pack, simulating the dynamic process of a high-speed flying foreign object impacting the battery pack. The structure is simple, the operation is flexible, and the response is rapid. It can better control the launching timing and force of the impact simulation piece. Combining with the adjustment of the catapulting angle by the adjustment component, various impact conditions with different angles and different forces can be simulated, comprehensively and realistically restoring the complex scenario of a vehicle encountering flying road debris during high-speed driving, providing a solid technical support for accurately evaluating the impact resistance performance of the battery pack under complex actual road conditions, and strongly promoting the development and improvement of the safety performance test technology of vehicle battery packs.

[0014] Further, the catapulting component further includes a housing, a piston plate and a gas supply device. The housing is mounted on the adjustment component. The piston plate is movably connected in the cavity of the housing and divides the cavity of the housing into a sealed cavity and a mounting cavity. The spring is located in the mounting cavity, and its two ends are respectively connected to the piston plate and the inner wall of the mounting cavity. One end of the mounting post is connected to the piston plate, and the other end passes through the sealed cavity and the housing. The piston is configured to be able to move between the sealed cavity and the mounting cavity to drive the mounting post to move along the first direction and the second direction;

[0015] An air inlet and an air outlet are formed on the housing. The air inlet and the air outlet are configured to be respectively capable of communicating with the first cavity. The gas supply device is connected to the air inlet for providing a gas source.

[0016] According to the above technical means, the cavity of the housing is divided into a sealed cavity and an installation cavity by a piston plate, and a pneumatic-spring cooperative drive system is constructed. Specifically, the air supply device supplies air to the sealed cavity through the air inlet. At this time, the air outlet is closed, and the gas pushes the piston plate to move, thereby driving the installation column to move in the first direction to compress the spring, realizing the energy storage process of the impact simulation piece. During this process, the compression degree of the spring can be flexibly adjusted through precise control of the air pressure, and the ejection energy reserve can be accurately controlled; when releasing the impact simulation piece, the air supply device stops supplying air, opens the air outlet to discharge the gas in the sealed cavity, and the spring returns to drive the installation column to move in the second direction, so as to release and eject the impact simulation piece under the action of inertia force. The response speed is fast and the action is stable, ensuring that the impact simulation piece can be ejected at a stable speed and angle, greatly improving the repeatability and accuracy of the test; at the same time, the spring provides a certain buffer protection under its own elasticity to avoid system damage, enhancing the reliability and stability of the entire ejection assembly; those skilled in the art can understand that the spring can also be installed in the sealed cavity, and its two ends are respectively connected to the inner wall of the sealed cavity and the piston plate, and the spring is stretched when the gas pushes the piston plate to move and then drives the installation column to move in the first direction.

[0017] Further, the ejection assembly further includes a sealing ring, and the sealing ring is installed on the piston plate and filled between the inner wall of the housing and the piston plate.

[0018] According to the above technical means, the sealing ring is tightly filled between the inner wall of the housing and the piston plate, ensuring the sealing performance of the sealed cavity, preventing gas leakage during the energy storage process, improving the controllability and accuracy of the ejection process, enabling the impact simulation piece to be ejected at a more stable speed and angle, and significantly improving the repeatability and accuracy of the test results.

[0019] Further, the ejection assembly further includes a pneumatic sensing device. The pneumatic sensing device is located in the installation cavity and installed on the piston plate. The pneumatic sensing device is configured to be able to abut against the inner wall of the installation cavity to detect the air pressure in the sealed cavity.

[0020] According to the above technical means, the air pressure in the sealed cavity is accurately detected by the degree of abutment between the pneumatic sensing device and the inner wall of the installation cavity. During the energy storage process, the air pressure change during the inflation process of the air supply device to the sealed cavity can be real-time feedback, enabling the operator to accurately control the air pressure value, and then accurately adjust the compression degree of the spring, realizing the fine setting of the ejection energy of the impact simulation piece, meeting the personalized requirements of different specifications of battery packs and diverse test scenarios for the impact force, and greatly improving the flexibility and adaptability of the test.

[0021] Further, the adjustment assembly includes:

[0022] A base and a mounting plate, the base is mounted on a track, one end of the mounting plate is connected to the base by a hinge, the other end of the mounting plate is configured to be able to flip around the rotating shaft of the hinge to adjust the tilt angle of the mounting plate, and the housing is mounted on the mounting plate;

[0023] It further includes two connecting plates and two support rods. The two connecting plates are symmetrically mounted on opposite sides of the mounting plate respectively. A plurality of adjustment holes are formed on the two connecting plates, and the adjustment holes are evenly distributed along the tilt direction of the mounting plate. One ends of the two support rods can be respectively connected to any one of the adjustment holes on one of the connecting plates, and the other ends of the two support rods are respectively hinged to the base.

[0024] According to the above technical means, the mounting plate is connected to the base by a hinge, enabling the mounting plate to flip around the hinge rotating shaft, so that the mounting plate can drive the housing to adjust different tilt angles, thereby adjusting the ejection angle of the impact simulation piece, with high flexibility; at the same time, through the connecting plate with adjustment holes evenly distributed along the tilt direction, and the support rods with one end detachably connected to any one of the adjustment holes and the other end hinged to the base, flexible and precise adjustment and support of the tilt angle of the mounting plate are realized. Specifically, in actual application, according to the actual test requirements, the mounting plate is flipped to a preset tilt angle, so that the impact simulation piece can be ejected at a preset ejection angle. At this time, rotate the two support rods to be respectively connected to the corresponding adjustment holes to provide a supporting force for the mounting plate, ensuring the stability of the set angle, avoiding the influence of angle deviation on the test accuracy during the test, providing a solid and reliable technical support for new energy enterprises to accurately detect the strength of battery packs and scientifically evaluate the vehicle safety risk level, and strongly promoting the progress of new energy vehicle safety performance detection technology.

[0025] Furthermore, it further includes:

[0026] A traction device, a steel cable and a traction trolley. The traction device, the steel cable and the traction trolley are respectively mounted on the track. One end of the steel cable is connected to the traction device, and the other end is connected to the traction trolley. The traction trolley is configured to be able to be connected to a new energy vehicle, and the traction device is configured to be able to drive the steel cable to drive the traction trolley to move, so that the new energy vehicle moves along the laying direction of the track;

[0027] A release device. The release device is mounted on the track. The traction trolley, the release device and the ejection assembly are distributed in sequence along the moving direction of the new energy vehicle. The release device is configured to release the traction trolley and the new energy vehicle when the traction trolley drives the new energy vehicle to move to the release device, so that the traction trolley is separated from the new energy vehicle.

[0028] According to the above technical means, a stable and precisely controllable mobile power source is provided for new energy vehicles through the combination of a traction device, a steel cable, and a traction trolley. The traction device drives the steel cable to drive the traction trolley to move, and then enables the new energy vehicle loaded with a battery pack at the bottom to move smoothly along the track. When the traction trolley drives the new energy vehicle to move to the preset position, i.e., the release device, the release device can quickly and precisely release the traction trolley and the new energy vehicle, so that the traction trolley is separated from the new energy vehicle, enabling the new energy vehicle to move freely along the track at a constant speed under the action of inertia until it collides with the impact simulation component. This improves the repeatability and accuracy of the test, avoids the errors and uncertainties that may be brought by manual operation, provides a strong guarantee for comprehensively and accurately evaluating the anti-impact performance of the battery pack in complex driving environments, and strongly promotes the further development of new energy vehicle safety performance detection technology.

[0029] Furthermore, a braking device is also included. The braking device is installed on the new energy vehicle and is controllably connected to the new energy vehicle for braking the new energy vehicle.

[0030] According to the above technical means, after the impact test of the new energy vehicle is completed, the new energy vehicle can be precisely controlled to decelerate and stop through the braking device, improving the test efficiency and meeting the requirements of different test scenarios. In addition, when the new energy vehicle moves along the track under the action of the traction device to simulate high-speed vehicle driving, if it is necessary to stop the new energy vehicle urgently due to unexpected situations, the braking device can quickly respond to the control instruction and apply a braking force to the new energy vehicle in a timely manner, effectively avoiding potential safety accidents and ensuring the safety of test personnel and equipment.

[0031] Furthermore, a triggering device is also included. The triggering device is installed on the track and is located between the ejection component and the release device. The triggering device is controllably connected to the ejection component and is configured to control the ejection component to release the impact simulation component when the new energy vehicle moves to the triggering device, so that the impact simulation component impacts the moving battery pack.

[0032] According to the above technical means, when the new energy vehicle loaded with a battery pack moves to the position of the triggering device according to the preset trajectory, the triggering device can accurately sense and quickly control the ejection component to release the impact simulation component, ensuring that the impact simulation component precisely initiates an impact at a specific position of the new energy vehicle. This position-triggered mechanism greatly improves the accuracy of the impact moment and impact position, guarantees a high degree of consistency of the test conditions, effectively improves the repeatability and reliability of the test results, and avoids the time errors and action deviations that may be brought by manual operation. It not only simplifies the test operation process, reduces the labor cost and operation difficulty, but also reduces the risk of test result distortion caused by human factors.

[0033] A method for simulating impact test of a vehicle battery pack, using the above-mentioned vehicle battery pack simulation impact test system, includes the following methods:

[0034] S1. Install the new energy vehicle at a set position on the track, and load the battery pack on the new energy vehicle. The battery pack is charged to a preset power.

[0035] S2. Place the impact simulation piece on the ejection component. The adjustment component adjusts the release angle of the ejection component to a preset angle, and the ejection component stores energy to a preset release speed.

[0036] S3. Use an external force to drive the new energy vehicle to drive the battery pack to move along the track at a preset speed.

[0037] S4. When the new energy vehicle drives the battery pack to move to the first specified position, the external force is separated from the new energy vehicle, and the new energy vehicle drives the battery pack to continue moving along the track at a constant speed.

[0038] S5. When the new energy vehicle drives the battery pack to move to the second specified position, the ejection component releases the impact simulation piece at a preset speed and angle to impact the moving battery pack.

[0039] S6. When the impact simulation piece finishes impacting the battery pack, the new energy vehicle brakes.

[0040] S7. Observe whether the battery pack undergoes thermal runaway, catches fire or explodes, record the time interval from impact to fire and explosion, and complete the test.

[0041] According to the above technical means, compared with the traditional battery safety performance test technology, the present application has high flexibility and can more truly and comprehensively restore the complex and changeable actual working condition of foreign objects splashing on the road surface when the vehicle is driving at high speed. Furthermore, the test results can more accurately reflect the impact resistance of the battery pack in actual use, providing strong support for new energy enterprises to accurately detect the strength of the battery pack and scientifically evaluate the vehicle safety risk level, and strongly promoting the development of new energy vehicle safety performance detection technology.

[0042] The beneficial effects of the present invention:

[0043] 1. Through the new energy vehicle and the track, the present invention enables the new energy vehicle with a battery pack loaded at the bottom to simulate the actual working condition of the vehicle driving at high speed, thereby providing a real and comprehensive impact test object for the impact simulation piece, ensuring the authenticity and effectiveness of the test results, and accurately reflecting the actual impact resistance of the battery pack.

[0044] 2. The present invention releases an impact simulation component at a set speed through an ejection component to impact a moving battery pack, thereby simulating a more realistic dynamic impact scenario similar to foreign object splashing during high-speed vehicle driving. At the same time, the ejection angle of the impact simulation component released by the ejection component is flexibly adjusted through an adjustment component, making up for the defect of the prior art that can only impact in a single direction. It has high flexibility and can more truly and comprehensively restore the complex and changeable actual working condition of foreign object splashing on the road surface when the vehicle is driving at high speed. Furthermore, the test results can more accurately reflect the impact resistance performance of the battery pack in actual use, providing strong support for new energy enterprises to accurately detect the strength of the battery pack and scientifically evaluate the vehicle safety risk level, and strongly promoting the development of new energy vehicle safety performance detection technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is an application diagram of the present invention;

[0046] Figure 2 is a cross-sectional view of the ejection component of the present invention;

[0047] Figure 3 is a schematic structural diagram of the adjustment component of the present invention Figure 1 ;

[0048] Figure 4 is a schematic structural diagram of the adjustment component of the present invention Figure 2 .

[0049] Among them, 1 - new energy vehicle; 2 - track; 3 - battery pack; 4 - impact simulation component; 5 - ejection component; 51 - spring; 52 - mounting post; 521 - mounting groove; 53 - housing; 531 - sealed cavity; 532 - mounting cavity; 533 - air inlet; 534 - air outlet; 535 - second mounting hole; 54 - piston plate; 55 - air supply device; 56 - sealing ring; 57 - air pressure sensing device; 6 - adjustment component; 61 - base; 62 - mounting plate; 621 - first mounting hole; 63 - hinge; 64 - connecting plate; 641 - adjustment hole; 65 - support rod; 71 - traction device; 72 - steel cable; 73 - traction trolley; 74 - release device; 8 - braking device; 9 - triggering device.

[0050] The drawings are only for illustrative purposes and should not be construed as limitations on this patent; for better illustration of this embodiment, some components in the drawings are omitted, enlarged or reduced, and do not represent the actual size of the product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted; the same or similar reference numerals correspond to the same or similar components; the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as limitations on this patent. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] It should be noted that, without conflict, the embodiments in the present application and the technical features in the embodiments may be combined with each other. The detailed descriptions in the specific embodiments should be understood as the explanatory illustration of the purpose of the present application and should not be regarded as an improper limitation to the present application.

[0052] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will further describe the specific technical solutions of the present application in detail with reference to the accompanying drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application but not to limit the scope of the present application.

[0053] In the embodiments of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0054] In the embodiments of the present application, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, "connection" may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium.

[0055] In the embodiments of the present application, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including such element.

[0056] The following will introduce and describe the technical solutions of this embodiment in detail with specific accompanying drawings.

[0057] Embodiment 1

[0058] As Figures 1 - 3As shown in the figure, a slant impact test system for a battery pack at the bottom of a new energy vehicle includes: a new energy vehicle 1 and a track 2. A battery pack 3 is loaded at the bottom of the new energy vehicle 1. The new energy vehicle 1 is installed on the track 2 and is configured to be able to move along the laying direction of the track 2; an impact simulation member 4 and an ejection assembly 5. The impact simulation member 4 is installed on the ejection assembly 5, and the ejection assembly 5 is installed on the track 2. The ejection assembly 5 is configured to be able to release the impact simulation member 4 so that the impact simulation member 4 impacts the moving battery pack 3; an adjustment assembly 6. The adjustment assembly 6 is installed on the track 2, and the ejection assembly 5 is installed on the adjustment assembly 6. The adjustment assembly 6 is configured to be able to adjust the angle at which the ejection assembly 5 releases the impact simulation member 4.

[0059] In this embodiment, through the new energy vehicle 1 and the track 2, the new energy vehicle 1 with the battery pack 3 loaded at the bottom can simulate the actual working conditions of the vehicle running at high speed, so as to provide a real and comprehensive impact test object for the impact simulation member 4, ensure the authenticity and effectiveness of the test results, and accurately reflect the actual impact resistance performance of the battery pack; the ejection assembly 5 releases the impact simulation member 4 at a set speed to impact the moving battery pack 3, so as to simulate a more dynamic impact scenario that is more in line with the situation of foreign objects splashing when the vehicle is running at high speed. At the same time, the adjustment assembly 6 flexibly adjusts the angle at which the ejection assembly 5 releases the impact simulation member 4, making up for the defect that the existing technology can only impact in a single direction, with high flexibility and being able to more realistically and comprehensively restore the complex and changeable actual working conditions of encountering foreign objects splashing on the road surface when the vehicle is running at high speed; specifically, in actual application, the ejection assembly 5 is located on the moving path of the new energy vehicle 1, and the impact simulation member 4 is placed on the ejection assembly 5. According to the actual test requirements, the adjustment assembly 6 adjusts the ejection assembly 5 to a preset release angle. The new energy vehicle 1 loaded with the battery pack 3 moves along the track 2 at a preset speed to simulate a running vehicle. When the new energy vehicle 1 moves to a specified position, the ejection assembly 5 can release the impact simulation member 4 at a preset ejection speed, so that the impact simulation member 4 can impact the moving battery pack 3 at a preset speed and angle, so as to realistically, comprehensively and effectively simulate the actual working conditions during vehicle driving, make the test results more accurately reflect the impact resistance performance of the battery pack in actual use, and provide strong support for new energy enterprises to accurately detect the strength of the battery pack and scientifically evaluate the vehicle safety risk level, and strongly promote the development of new energy vehicle safety performance detection technology; among them, the impact simulation member 4 can be simulated foreign objects such as stones, metal fragments, branches, etc.

[0060] As Figure 1As shown in the figure, in this embodiment, it further includes: a traction device 71, a steel cable 72, and a traction trolley 73. The traction device 71, the steel cable 72, and the traction trolley 73 are respectively installed on the track 2. One end of the steel cable 72 is connected to the traction device 71, and the other end is connected to the traction trolley 73. The traction trolley 73 is configured to be connectable to the new energy vehicle 1. The traction device 71 is configured to be able to drive the steel cable 72 to drive the traction trolley 73 to move, so that the new energy vehicle 1 moves along the laying direction of the track 2; a release device 74, the release device 74 is installed on the track 2. The traction trolley 73, the release device 74, and the ejection assembly 5 are arranged in sequence along the moving direction of the new energy vehicle 1. The release device 74 is configured to release the traction trolley 73 and the new energy vehicle 1 when the traction trolley 73 drives the new energy vehicle 1 to move to the release device 74, so that the traction trolley 73 is separated from the new energy vehicle 1.

[0061] Specifically, in actual application, the combination of the traction device 71, the steel cable 72, and the traction trolley 73 provides a stable and precisely controllable moving power source for the new energy vehicle 1. The traction device 71 drives the steel cable 72 to drive the traction trolley 73 to move, and then the new energy vehicle 1 loaded with the battery pack 3 moves smoothly along the track 2. When the traction trolley 73 drives the new energy vehicle 1 to move to the preset position, that is, the release device 74, the release device 74 can quickly and accurately release the traction trolley 73 and the new energy vehicle 1, so that the traction trolley 73 is separated from the new energy vehicle 1, enabling the new energy vehicle 1 to move freely along the track 2 at a constant speed under the action of inertia until it collides with the impact simulation part 4, improving the repeatability and accuracy of the test, avoiding errors and uncertainties that may be brought by manual operation, providing a strong guarantee for comprehensively and accurately evaluating the anti-impact performance of the battery pack in a complex driving environment, and strongly promoting the further development of new energy vehicle safety performance detection technology; among them, the release device 74 adopts a release structure known to those skilled in the art, such as a release plate.

[0062] As Figure 1 As shown in the figure, in this embodiment, it further includes a braking device 8. The braking device 8 is installed on the new energy vehicle 1. The braking device 8 is connected to the new energy vehicle 1 for control and is used to brake the new energy vehicle 1; specifically, in actual application, when the new energy vehicle 1 completes the impact test, the braking device 8 can accurately control the new energy vehicle 1 to decelerate and stop, improving the test efficiency and meeting the requirements of different test scenarios; in addition, when the new energy vehicle 1 moves along the track 2 under the action of the traction device 71 to simulate high-speed vehicle driving, if an emergency stop of the new energy vehicle is required due to sudden situations such as equipment failures and abnormal test parameters, the braking device 8 can quickly respond to the control command and apply a braking force to the new energy vehicle 1 in a timely manner, effectively avoiding potential safety accidents and ensuring the safety of test personnel and equipment; among them, the braking device 8 adopts a braking structure known to those skilled in the art, such as a brake.

[0063] As Figure 1 shown, in this embodiment, it further includes a triggering device 9. The triggering device 9 is installed on the track 2 and is located between the ejection assembly 5 and the bracket of the release device 74. The triggering device 9 is controllably connected to the ejection assembly 5. The triggering device 9 is configured to control the ejection assembly 5 to release the impact simulation member 4 when the new energy vehicle 1 moves to the triggering device 9, so that the impact simulation member 4 impacts the moving battery pack 3. Specifically, in actual application, when the new energy vehicle 1 loaded with the battery pack 3 moves to the position of the triggering device 9 according to a preset trajectory, the triggering device 9 can accurately sense and quickly control the ejection assembly 5 to release the impact simulation member 4, ensuring that the impact simulation member 4 accurately initiates an impact at a specific position of the new energy vehicle 1. This position-triggered mechanism greatly improves the accuracy of the impact moment and the impact position, ensures a high degree of consistency in the test conditions, effectively improves the repeatability and reliability of the test results, and avoids the time error and action deviation that may be brought by manual operation. It not only simplifies the test operation process, reduces the labor cost and operation difficulty, but also reduces the risk of test result distortion caused by human factors. Among them, the triggering device 9 uses a trigger switch known to those skilled in the art.

[0064] Embodiment 2

[0065] As Figures 1 - 4 shown, based on Embodiment 1, the difference from Embodiment 1 is that:

[0066] As Figure 2 shown, the ejection assembly 5 includes a spring 51 and a mounting post 52. One end of the spring 51 is connected to the adjustment assembly 6, and the other end is connected to one end of the mounting post 52. The other end of the mounting post 52 is formed with a mounting groove 521. The impact simulation member 4 can be placed in the mounting groove 521. The mounting post 52 is configured to be able to move in a first direction and a second direction. When the mounting post 52 moves in the first direction, the spring 51 is compressed or stretched, and the impact simulation member 4 is located in the mounting groove 521. When the mounting post 52 moves in the second direction, the spring 51 resets, and the impact simulation member 4 disengages from the mounting groove 521 to be released.

[0067] In this embodiment, through the cooperation of the spring 51 and the mounting post 52, a power source for catapulting the impact simulation member 4 is provided. The magnitude of the catapulting force can be adjusted by controlling the degree of compression or stretching of the spring 51, so as to realize the release of the impact simulation member 4 at a set speed. Specifically, when the mounting post 52 moves along the first direction by an external force, the spring 51 is compressed or stretched to a preset degree to store energy for subsequent catapulting. The impact simulation member 4 can be stably placed in the mounting groove 521, ensuring the reliable fixation of the impact simulation member 4 in the preparation stage and avoiding premature detachment from affecting the test results. When performing the impact test, the external force driving the mounting post 52 is cancelled, and the spring 51 resets, driving the mounting post 52 to move along the second direction. Thus, under the action of inertia, the impact simulation member 4 is accurately and quickly released and catapulted to impact the moving battery pack 3, simulating the dynamic process of a high-speed flying foreign object impacting the battery pack 3. The structure is simple, the operation is flexible, and the response is rapid. It can better control the launching timing and force of the impact simulation member 4. Combining the adjustment of the catapulting angle by the adjustment assembly 6, various impact conditions with different angles and different forces can be simulated, comprehensively and realistically restoring the complex scenario of a vehicle encountering flying road debris during high-speed driving, providing strong technical support for accurately evaluating the anti-impact performance of the battery pack under complex actual road conditions, and strongly promoting the development and improvement of the safety performance test technology of vehicle-mounted battery packs.

[0068] As Figure 2 shown, in this embodiment, the catapulting assembly 5 further includes a housing 53, a piston plate 54, and a gas supply device 55. The housing 53 is mounted on the adjustment assembly 6. The piston plate 54 is movably connected in the cavity of the housing 53 and divides the cavity of the housing 53 into a sealed cavity 531 and a mounting cavity 532. The spring 51 is located in the mounting cavity 532, and its two ends are respectively connected to the piston plate 54 and the inner wall of the mounting cavity 532. One end of the mounting post 52 is connected to the piston plate 54, and the other end passes through the sealed cavity 531 and the housing 53. The piston 54 is configured to be able to move between the sealed cavity 531 and the mounting cavity 532 to drive the mounting post 52 to move along the first direction and the second direction. An air inlet 533 and an air outlet 534 are formed on the housing 53. The air inlet 533 and the air outlet 534 are configured to be respectively communicable with the first cavity 531. The gas supply device 55 is connected to the air inlet 533 for providing a gas source.

[0069] In this embodiment, the piston plate 54 divides the cavity of the housing 53 into a sealed cavity 531 and an installation cavity 532, constructing a pneumatic-spring collaborative drive system. Specifically, in practical applications, the air supply device 55 supplies air to the sealed cavity 531 through the air inlet 533. At this time, the air outlet 534 is closed, and the gas pushes the piston plate 54 to move, thereby driving the installation column 52 to move in the first direction to compress the spring 51, realizing the energy storage process of the impact simulator 4. In this process, the compression degree of the spring 51 can be flexibly adjusted through precise control of the air pressure, and the ejection energy reserve can be accurately controlled. When the impact simulator 4 is released, the air supply device 55 stops supplying air, opens the air outlet 534 to discharge the gas in the sealed cavity 531, and the spring 51 returns to drive the installation column 52 to move in the second direction, so as to release and eject the impact simulator 4 under the action of inertia force. The response speed is fast and the action is stable, ensuring that the impact simulator 4 can be ejected at a stable speed and angle, greatly improving the repeatability and accuracy of the test. At the same time, the spring 51 provides a certain buffer protection under the action of its own elasticity to avoid system damage and enhance the reliability and stability of the entire ejection assembly 5. Those skilled in the art can understand that the spring 51 can also be installed in the sealed cavity 531, and its two ends are respectively connected to the inner wall of the sealed cavity 531 and the piston plate 54. When the gas pushes the piston plate 54 to move, thereby driving the installation column 52 to move in the first direction, the spring 51 is stretched. Among them, the air supply device 55 can be an air compressor. As a preferred embodiment of this embodiment, the installation column 52 and the piston plate 54 are integrally formed.

[0070] As Figure 2 shown, in this embodiment, the ejection assembly 5 further includes a sealing ring 56. The sealing ring 56 is installed on the piston plate 54 and fills the space between the inner wall of the housing 53 and the piston plate 54. By tightly filling the space between the inner wall of the housing 53 and the piston plate 54 with the sealing ring 56, the sealing performance of the sealed cavity 531 is ensured, preventing gas leakage during the energy storage process, improving the controllability and accuracy of the ejection process, enabling the impact simulator to be ejected at a more stable speed and angle, and significantly improving the repeatability and accuracy of the test results.

[0071] As Figure 2As shown, in this embodiment, the ejection assembly 5 further includes a barometric pressure sensing device 57. The barometric pressure sensing device 57 is located in the installation cavity 532 and installed on the piston plate 54. The barometric pressure sensing device 57 is configured to be able to abut against the inner wall of the installation cavity 532 to detect the air pressure in the sealed cavity 531. Specifically, in actual application, the air pressure in the sealed cavity 531 is accurately detected by the degree of abutment between the barometric pressure sensing device 57 and the inner wall of the installation cavity 532. During the energy storage process, the change in air pressure during the inflation of the sealed cavity 531 by the air supply device 55 can be real-time feedback, enabling the operator to precisely control the air pressure value, and then precisely adjust the compression degree of the spring 51, so as to achieve a fine setting of the ejection energy of the impact simulation piece 4, meet the personalized requirements of different specifications of battery packs and diverse test scenarios for the impact force, and greatly improve the flexibility and adaptability of the test. Among them, the barometric pressure sensing device 57 can be a barometric pressure sensor.

[0072] As Figure 3 and Figure 4 As shown, in this embodiment, the adjustment assembly 6 includes: a base 61 and a mounting plate 62. The base 61 is installed on the track 2. One end of the mounting plate 62 is connected to the base 61 through a hinge 63. The other end of the mounting plate 62 is configured to be able to rotate around the rotating shaft of the hinge 63 to adjust the inclination angle of the mounting plate 62. The housing 53 is installed on the mounting plate 62. It also includes two connecting plates 64 and two support rods 65. The two connecting plates 64 are symmetrically installed on the opposite sides of the mounting plate 62 respectively. A plurality of adjustment holes 641 are formed on the two connecting plates 64. The adjustment holes 641 are evenly distributed along the inclination direction of the mounting plate 62. One end of each of the two support rods 65 can be connected to any one of the adjustment holes 641 on one of the connecting plates 64, and the other ends of the two support rods 65 are respectively hinged on the base 61.

[0073] In this embodiment, the mounting plate 62 is connected to the base 61 through a hinge 63, enabling the mounting plate 62 to rotate around the hinge 3 axis, so that the mounting plate 62 can drive the housing 53 to adjust different tilting angles, thereby adjusting the ejection angle of the impact simulation member 4, with high flexibility. At the same time, through the connecting plate 64 with adjustment holes 641 evenly distributed along the inclined direction, and the support rods 65 with one end detachably connected to any one of the adjustment holes 641 and the other end hinged to the base 61, flexible and precise adjustment and support of the tilting angle of the mounting plate 62 are achieved. Specifically, in actual application, according to the actual test requirements, the mounting plate 62 is flipped to a preset tilting angle, so that the impact simulation member 4 can be ejected at a preset ejection angle. At this time, the two support rods 65 are rotated to be respectively connected to the corresponding adjustment holes 641 to provide a supporting force for the mounting plate 62, ensuring the stability of the set angle, avoiding the influence of angle deviation on the test accuracy during the test, providing a solid and reliable technical support for new energy enterprises to accurately detect the strength of the battery pack and scientifically evaluate the vehicle safety risk level, and strongly promoting the progress of new energy vehicle safety performance detection technology.

[0074] As a preferred implementation manner of this embodiment, a plurality of first mounting holes 621 are formed on the mounting plate 62, and the first mounting holes 621 are evenly distributed. Two or more second mounting holes 535 are formed on the housing 53, and each second mounting hole 535 is configured to be able to be connected to the corresponding first mounting hole 621 through a bolt to detachably mount the housing 53 on the mounting plate 62. Specifically, the first mounting holes 621 on the mounting plate 62 are detachably connected to the second mounting holes 535 on the housing 53 through bolts, and the mounting position of the housing 53 on the mounting plate 62 can be flexibly adjusted according to different test requirements. It can not only realize the position adjustment of the housing 53 on the plane to simulate diverse combinations of impact positions and angles, but also adapt to battery packs 3 of different sizes and specifications, improving the versatility and flexibility of the test system, meeting the requirements of diverse test scenarios, with a simple structure and convenient maintenance, repair and replacement work.

[0075] The remaining features and working principles of this embodiment are the same as those of Embodiment 1.

[0076] Embodiment 3

[0077] In this embodiment, a method for simulating impact testing of a vehicle battery pack is provided. The new energy vehicle bottom battery pack oblique impact testing system in Embodiment 1 or Embodiment 2 is adopted, including the following steps:

[0078] S1. Install the traction device 71, the ejection assembly 5, the trigger device 9, the release device 74, the traction cart 73, and the new energy vehicle 1 at the set positions on the track 2 in sequence. Connect the traction device 71 and the steel cable 72 to the traction cart 73, connect the traction cart 73 to the new energy vehicle 1, load the battery pack 3 at the bottom of the new energy vehicle 1, install the braking device 8 on the new energy vehicle 1, and charge the battery pack 3 to the preset power.

[0079] S2. Place the impact simulation piece 4 on the ejection assembly 5, and adjust the preset ejection angle of the ejection assembly 5 through the adjustment assembly 6. The ejection assembly 5 stores energy to the preset release speed.

[0080] S3. Start the traction device 71 to drive the steel cable 72 to drive the traction cart 73 and the new energy vehicle 1 to move along the track 2 at the preset speed.

[0081] S4. When the traction cart 73 drives the new energy vehicle 1 to move to the position of the release device 74, the traction cart 73 is separated from the new energy vehicle 1, and the new energy vehicle 1 continues to move along the track 2 at the speed.

[0082] S5. When the new energy vehicle 1 drives the battery pack 3 to move to the position of the trigger device 9, the ejection assembly 5 releases the impact simulation piece 4 at the set speed and angle to impact the moving battery pack 3.

[0083] S6. When the impact simulation piece 4 finishes impacting the battery pack 3, the braking device 8 brakes the new energy vehicle 1.

[0084] S7. Observe whether the battery pack 3 undergoes thermal runaway, catches fire, or explodes, record the time interval from the impact of the battery pack 3 to catching fire and explosion, and complete the test.

[0085] Compared with the traditional battery safety performance testing technology, the present application has high flexibility and can more realistically and comprehensively restore the complex and changeable actual working condition of foreign objects splashing on the road surface when the vehicle is driving at high speed. Furthermore, the test results can more accurately reflect the impact resistance of the battery pack in actual use, providing strong support for new energy enterprises to accurately detect the strength of the battery pack and scientifically evaluate the vehicle safety risk level, and strongly promoting the development of new energy vehicle safety performance testing technology.

[0086] The serial numbers of the embodiments of the present application above are only for description and do not represent the superiority or inferiority of the embodiments. The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present application by the same token.

Claims

1. A bottom battery pack oblique impact test system for new energy vehicles, characterized in that, Comprising: A new energy vehicle (1) and a track (2), a battery pack (3) is loaded at the bottom of the new energy vehicle (1), the new energy vehicle (1) is installed on the track (2), and the new energy vehicle (1) is configured to be able to move along the laying direction of the track (2); An impact simulation member (4) and an ejection assembly (5), the impact simulation member (4) is installed on the ejection assembly (5), the ejection assembly (5) is installed on the track (2), and the ejection assembly (5) is configured to be able to release the impact simulation member (4) so that the impact simulation member (4) impacts the moving battery pack (3); An adjustment assembly (6), the adjustment assembly (6) is installed on the track (2), the ejection assembly (5) is installed on the adjustment assembly (6), and the adjustment assembly (6) is configured to be able to adjust the angle at which the ejection assembly (5) releases the impact simulation member (4).

2. The inclined impact test system for the bottom battery pack of a new energy vehicle according to claim 1, wherein The ejection assembly (5) includes a spring (51) and a mounting post (52), one end of the spring (51) is connected to the adjustment assembly (6), the other end is connected to one end of the mounting post (52), the other end of the mounting post (52) is formed with a mounting groove (521), the impact simulation member (4) can be placed in the mounting groove (521), and the mounting post (52) is configured to be able to move along a first direction and a second direction; When the mounting post (52) moves along the first direction, the spring (51) is compressed or stretched, and the impact simulation member (4) is located in the mounting groove (521); when the mounting post (52) moves along the second direction, the spring (51) resets, and the impact simulation member (4) disengages from the mounting groove (521) to be released.

3. The inclined impact test system for the bottom battery pack of a new energy vehicle according to claim 2, characterized in that, The ejection assembly (5) further includes a housing (53), a piston plate (54) and a gas supply device (55), the housing (53) is installed on the adjustment assembly (6), the piston plate (54) is movably connected in the cavity of the housing (53) and divides the cavity of the housing (53) into a sealed cavity (531) and a mounting cavity (532), the spring (51) is located in the mounting cavity (532), and its two ends are respectively connected to the piston plate (54) and the inner wall of the mounting cavity (532), one end of the mounting post (52) is connected to the piston plate (54), and the other end passes through the sealed cavity (531) and the housing (53), and the piston (54) is configured to be able to move between the sealed cavity (531) and the mounting cavity (532) to drive the mounting post (52) to move along the first direction and the second direction; An air inlet (533) and an air outlet (534) are formed on the housing (53), the air inlet (533) and the air outlet (534) are configured to be respectively able to communicate with the first cavity (531), and the gas supply device (55) is connected to the air inlet (533) for providing a gas source.

4. The inclined impact test system for the bottom battery pack of a new energy vehicle according to claim 3, characterized in that The ejection assembly (5) further includes a sealing ring (56), the sealing ring (56) is installed on the piston plate (54) and fills the space between the inner wall of the housing (53) and the piston plate (54).

5. A bottom battery pack oblique impact test system for a new energy vehicle according to claim 3, characterized in that, The ejection assembly (5) further includes a barometric sensing device (57). The barometric sensing device (57) is located within the installation cavity (532) and is mounted on the piston plate (54). The barometric sensing device (57) is configured to be able to abut against the inner wall of the installation cavity (532) to detect the air pressure within the sealed cavity (531).

6. The inclined impact test system for the bottom battery pack of a new energy vehicle according to claim 3, characterized in that, The adjustment assembly (6) includes: A base (61) and a mounting plate (62). The base (61) is mounted on the track (2). One end of the mounting plate (62) is connected to the base (61) through a hinge (63). The other end of the mounting plate (62) is configured to be able to flip around the rotating shaft of the hinge (63) to adjust the inclination angle of the mounting plate (62). The housing (53) is mounted on the mounting plate (62). It further includes two connecting plates (64) and two support rods (65). The two connecting plates (64) are symmetrically mounted on the opposite sides of the mounting plate (62) respectively. A plurality of adjustment holes (641) are formed on the two connecting plates (64). Each of the adjustment holes (641) is evenly distributed along the inclination direction of the mounting plate (62). One end of each of the two support rods (65) can be connected to any one of the adjustment holes (641) on one of the connecting plates (64). The other ends of the two support rods (65) are respectively hinged to the base (61).

7. A bottom battery pack oblique impact test system for a new energy vehicle according to claim 1, characterized in that It further includes: A traction device (71), a steel cable (72), and a traction trolley (73). The traction device (71), the steel cable (72), and the traction trolley (73) are respectively mounted on the track (2). One end of the steel cable (72) is connected to the traction device (71), and the other end is connected to the traction trolley (73). The traction trolley (73) is configured to be able to be connected to the new energy vehicle (1). The traction device (71) is configured to be able to drive the steel cable (72) to drive the traction trolley (73) to move, so that the new energy vehicle (1) moves along the laying direction of the track (2). A release device (74). The release device (74) is mounted on the track (2). The traction trolley (73), the release device (74), and the ejection assembly (5) are sequentially distributed along the moving direction of the new energy vehicle (1). The release device (74) is configured to release the traction trolley (73) and the new energy vehicle (1) when the traction trolley (73) drives the new energy vehicle (1) to move to the release device (74), so that the traction trolley (73) is separated from the new energy vehicle (1).

8. The inclined impact test system for the bottom battery pack of a new energy vehicle according to claim 1, wherein, It further includes a braking device (8). The braking device (8) is mounted on the new energy vehicle (1). The braking device (8) is control-connected to the new energy vehicle (1) and is used to brake the new energy vehicle (1).

9. The inclined impact test system for the bottom battery pack of a new energy vehicle according to claim 7, wherein, It further includes a triggering device (9), which is installed on the track (2) and located between the ejection assembly (5) and the release device (74). The triggering device (9) is in control connection with the ejection assembly (5), and is configured to control the ejection assembly (5) to release the impact simulation piece (4) when the new energy vehicle (1) moves to the triggering device (9), so that the impact simulation piece (4) impacts the moving battery pack (3).

10. A method for simulating an impact test of a vehicle battery pack, characterized in that, Adopting the bottom battery pack oblique impact test system for new energy vehicles according to any one of claims 1-9, including the following method: S1. Install the new energy vehicle (1) at a set position on the track (2), and load the battery pack (3) on the new energy vehicle (1), and charge the battery pack (3) to a preset power; S2. Place the impact simulation piece (4) on the ejection assembly (5), and the adjustment assembly (6) adjusts the release angle of the ejection assembly (5) to a preset angle, and the ejection assembly (5) stores energy to a preset release speed; S3. Use an external force to drive the new energy vehicle (1) to drive the battery pack (3) to move along the track (2) at a preset speed; S4. When the new energy vehicle (1) drives the battery pack (3) to move to the first designated position, the external force is separated from the new energy vehicle (1), and the new energy vehicle (1) drives the battery pack (3) to continue to move along the track (2) at a constant speed; S5. When the new energy vehicle (1) drives the battery pack (3) to move to the second designated position, the ejection assembly (5) releases the impact simulation piece (4) at a preset speed and angle to impact the moving battery pack (3); S6. When the impact simulation piece (4) finishes impacting the battery pack (3), the new energy vehicle (1) brakes; S7. Observe whether the battery pack (3) undergoes thermal runaway, catches fire or explodes, record the time interval from impact to fire and explosion, and complete the test.

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