Impact test system for obstacles at bottom of power storage battery

Abstract

The utility model relates to a power storage battery bottom barrier impact test system, which comprises a movable trolley, a track, an impact block, a damping mechanism, a barrier, a power storage battery fixing tool and a traction mechanism, and is characterized in that the movable trolley is dragged through the traction mechanism, and the impact block on the movable trolley impacts a power storage battery to be tested in an inertia mode; and meanwhile, the impact point of the impact block can be adjusted by adjusting the position of the cross beam of the damping mechanism relative to the longitudinal beam, so that the power storage battery can be tested more comprehensively, and the safety performance development of the power storage battery is improved.

Description

Technical Field

[0001] The utility model relates to the field of electric vehicles, in particular to a power battery bottom obstacle impact test system. Background Art

[0002] With the rapid development of the electric vehicle industry, the production and sales of electric vehicles are growing rapidly, and the electrical safety of electric vehicles has attracted more and more attention. The power battery of electric vehicles is affected by external forces such as impact and extrusion, which causes the power battery shell to deform, leading to internal thermal runaway and causing electric vehicles to catch fire. The abuse test of electric vehicle power batteries is increasingly used for power battery safety performance testing.

[0003] The current abuse test of the bottom of the power battery generally uses an impact head of a certain mass and shape to vertically impact the bottom of the power battery along the track with a certain energy. In actual accidents, there are situations where the bottom of the car power battery hits an obstacle and the vehicle continues to drive. At this time, scratches will be formed on the collision point. This type of working condition has a large degree of damage. Most of the existing tests do not cover this type of working condition, which is not conducive to improving the development of power battery safety performance. Although there are some test institutions for scratching the bottom of the power battery in the prior art, for example, CN114354480A discloses a test device for scratching the bottom of the power battery of an electric vehicle, which uses a movable scratching head to scratch different positions of the bottom of the power battery to simulate the bottom of the power battery being scratched by foreign objects for detection. The vehicle speed in an actual accident is often relatively high, and the existing bottom scraping mechanism is difficult to reach the speed at the time of the accident. In order to reach the vehicle speed at which the accident occurred, a mobile trolley impact test can only be adopted, but this test can often only impact several specific positions of the power battery to be tested, and it is difficult to achieve impact testing of various parts of the power battery. Therefore, the utility model provides an adjustable damping device and a power battery bottom obstacle impact test system, which can perform collision simulation tests on multiple points at the bottom of the power battery, thereby improving the development of the safety performance of the power battery. Utility Model Content

[0004] The utility model aims to provide a power battery bottom obstacle impact test system, which can adjust the distance between the damping device and the barrier, thereby changing the impact position of the impact block on the power battery, and can realize impact tests on multiple positions of the bottom of the power battery.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A power battery bottom obstacle impact test system, comprising:

[0007] track;

[0008] A mobile trolley, the mobile trolley comprising a trolley body, a guide rail portion arranged at the bottom of the trolley body and a base arranged on the trolley body, the trolley body being movably placed on the track through the guide rail portion;

[0009] A traction mechanism, the traction mechanism is connected to the mobile trolley, the traction mechanism can pull the mobile trolley to move along the track, and can release the mobile trolley;

[0010] Barrier;

[0011] A damping mechanism, the damping mechanism comprises a crossbeam, a pair of longitudinal beams, a damping base, a damping plug and a limit pin, the pair of longitudinal beams are respectively located on the left and right sides of the barrier, one end of the longitudinal beam is fixedly connected to the barrier, and the other end extends in a direction away from the barrier, and the longitudinal beam is provided with a plurality of pairs of limit holes arranged at intervals in the direction away from the barrier, and the left and right ends of the crossbeam are provided with fixing holes, and the limit pins are inserted into the fixing holes and the limit holes corresponding to the longitudinal beams to fix the crossbeam and the longitudinal beams; the damping base is fixed to the crossbeam, and the damping plug is fixed to the mobile trolley, and when the damping plug contacts the damping base, the mobile trolley can be turned from a moving state to a stopped state;

[0012] A power battery fixing tool, the power battery fixing tool comprising a fixing frame and a power battery mounting plate, the power battery mounting plate being fixedly mounted on the barrier through the fixing frame; and

[0013] An impact block is placed on the base of the mobile trolley, and when the mobile trolley is converted from the moving state to the stopped state, the impact block can fly out from the base to the power battery mounting plate due to inertia and hit the power battery to be tested fixed on the power battery mounting plate.

[0014] In one embodiment, the barrier is provided with a plurality of fixing grooves extending in the left-right direction, and one end of the fixing frame is selectively fixed in the corresponding fixing groove.

[0015] In one embodiment, the cross beam includes a bow-shaped main body portion, the front end of the main body portion facing the mobile trolley is provided with a fixing plate for fixing the damping base, the rear end of the main body portion facing the barrier is provided with an arc structure protruding toward the barrier direction, and the hollow portion between the arc structure and the main body portion is provided with a plurality of spokes.

[0016] In one embodiment, the base includes a fixing member, a plurality of extension members and a plurality of guide strips, the fixing member having a left side wall, a right side wall and a tail wall connected to the tail of the left side wall and the right side wall at right angles, the fixing member is fixedly connected to the trolley body, the extension member is fixed to the upper part of the left and right side walls by fixing bolts and extends vertically to the connected left or right side wall, the plurality of guide strips are extended along the direction of the track and are fixed to the inner sides of the left and right side walls of the fixing member and the inner side of the extension member by fixing bolts, and the plurality of guide strips jointly plan a space that matches the shape of the impact block.

[0017] In one embodiment, the surface where the guide bar contacts the impact block is an arc-shaped curved surface.

[0018] In one embodiment, the base on the trolley body includes an upper base and a lower base, both of which are located directly above the guide rail, and the upper base and the lower base are not only staggered in the height direction, but also in the front-rear direction.

[0019] In one embodiment, the angle between the power battery mounting plate and the horizontal plane is 20-30°.

[0020] In one embodiment, the angle between the power battery mounting plate and the horizontal plane is 25°.

[0021] In one embodiment, the traction mechanism includes a traction rope, a driving motor that drives the traction rope to move along the extension direction of the track, and a traction vehicle that is towed by the traction rope. The traction vehicle tows the mobile trolley through the traction rope, and after the mobile trolley is towed by the traction vehicle to a preset distance, the traction vehicle releases the traction rope and disengages from the mobile trolley.

[0022] In one embodiment, a traction rope fixing device is also provided at the bottom of the trolley body, and the traction rope fixing device includes a first clamp block and a second clamp block that are matched with each other. One of the first clamp block and the second clamp block can move toward the other to clamp and fix the traction rope between the first clamp block and the second clamp block.

[0023] The utility model adopts the above technical solution, which has the beneficial effect that the power battery bottom obstacle impact test system provided by the utility model tows the mobile trolley through the traction mechanism, and allows the impact block on the mobile trolley to impact the power battery to be tested in an inertial manner, and at the same time, the impact point of the impact block can be adjusted by adjusting the position of the damping mechanism crossbeam relative to the longitudinal beam, so that the power battery can be tested more comprehensively, thereby improving the safety performance development of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a power battery bottom obstacle impact test system is shown.

[0025] Figure 2 A schematic diagram of the mobile trolley is shown.

[0026] Figure 3 A schematic diagram of the impact block is shown.

[0027] Figure 4 A schematic diagram of the base is shown.

[0028] Figure 5 A schematic diagram of the bottom of the mobile trolley is shown.

[0029] Figure 6 A schematic diagram showing the damping mechanism being mounted on a barrier.

[0030] Figure 7 A schematic diagram of the beam is shown.

[0031] Figure 8 A schematic diagram of a longitudinal beam is shown.

[0032] Fig. 9 A side view of a power battery bottom obstacle impact test system is shown. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0034] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0035] Unless the context requires otherwise, throughout the specification and claims, the word "comprise" and variations such as "include" and "have" should be construed in an open, inclusive sense, ie, should be interpreted as "including, but not limited to."

[0036] References throughout the specification to "one embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0037] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise.

[0038] In the following description, in order to clearly demonstrate the structure and working mode of the utility model, many directional words will be used for description, but the words "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as restrictive terms.

[0039] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] like Figure 1 As shown, this embodiment provides a power battery bottom obstacle impact test system, including a mobile trolley, a track, an impact block, a damping mechanism, a barrier, a power battery fixing tool and a traction mechanism. The track, the power battery fixing tool and the traction mechanism are not shown in FIG1 .

[0042] See also Figure 1 and Figure 2The mobile trolley 1 includes a trolley body 11, which is formed by welding steel materials such as plate ribs and pipe fittings. The bottom of the trolley body 11 is a guide rail portion 12 that matches the track. The guide rail portion 12 can be slidably placed on the track so that the mobile trolley 1 can move along the track. A base is provided on the upper part of the trolley body 11, and the base is used to accommodate the impact block so that the impact block can move with the mobile trolley. In this embodiment, an upper base 13 and a lower base 14 are provided on the trolley body 11, and the upper base 13 and the lower base 14 are both located directly above the guide rail portion 12, that is, the upper base 13 and the lower base 14 are also located directly above the track. When the impact block is placed on the upper base 13 or the lower base 14, the center of gravity of the impact block is also located directly above the track, so that the mobile trolley 1 is not easy to tilt in the left and right directions when moving on the track, and the impact position of the impact block can be more accurately controlled.

[0043] See also Figure 2 The upper base 13 and the lower base 14 are not only staggered in the height direction, but also staggered in the front-to-back direction (i.e., the moving direction of the mobile trolley 1), wherein the upper base 13 is close to the rear end of the trolley body 11, and the lower base 14 is close to the front end of the trolley body 11, so that the impact block placed on the upper base 13 or the lower base 14 can collide with different positions of the power battery, which is convenient for selecting different collision points for testing. Figure 3 The impact block 2 is a rectangular metal block, and the edges of the impact block 2 are rounded to simulate the appearance structure of a conventional curbstone colliding with the bottom of the power battery. Figure 4 , Figure 4 A schematic diagram of the upper base 13 is shown. The upper base 13 includes a fixing member 131 , an extension member 132 and a plurality of guide strips 133 . The fixing member 131 includes a left side wall, a right side wall and a tail wall at the tail, which are arranged at right angles. The fixing member 131 is rigidly fixed to the trolley body 11, and is fixed to the trolley body 11 by welding in the present application. The extension member 132 is fixed to the upper part of the left and right side walls by fixing bolts 134 and extends vertically to the connected left side wall or right side wall. A plurality of guide strips 133 are fixed to the inner side of the left and right side walls of the fixing member 131 and the inner side of the extension member 132 by fixing bolts 134, and the plurality of guide strips 133 jointly plan a space that matches the shape of the impact block 2, so that the impact block 2 can be placed in the space. At the same time, when the mobile trolley 1 is converted from a moving state to a stopped state, when the impact block 2 flies out from the upper base 13 or the lower base 14 due to inertia, the guide strip 133 can guide the flying direction of the impact block 2, so that the impact block 2 can more accurately hit the test point corresponding to the power battery. The rear wall of the fixing member 131 is used to block the impact block 2 to prevent the impact block 2 from escaping from the space from the rear.

[0044] Preferably, the surface where the guide bar 133 contacts the impact block 2 is an arc-shaped curved surface to reduce the contact resistance between the guide bar 133 and the impact block 2, so that the impact block 2 can smoothly fly out of the base due to inertia. In addition, since the guide bar 133 is fixed to the inner side of the left and right side walls of the fixing member 131 and the inner side of the extension member 132 by the fixing bolts 134, the gap and pressure between the guide bar 133 and the impact block 2 can be adjusted by adjusting the locking length of the fixing bolts 134, so that the friction resistance of the impact block 2 in the base can be adjusted, and the speed of the impact block 2 when it flies out of the base can be adjusted to a certain extent. Since the structure of the lower base 14 is the same as that of the upper base 13, the structure of the lower base 14 is not described repeatedly.

[0045] See also Figure 2 and Figure 5 A traction rope fixing device 15 is also provided at the bottom of the trolley body 11. The traction rope fixing device 15 includes a first clamping block 151, a second clamping block 152 and a wrench 153 that are matched. The first clamping block 151 and the second clamping block 152 are fixedly installed at the bottom of the trolley body 11, and one of the first and second clamping blocks can move toward each other. In this embodiment, the second clamping block 152 is a movable part, and the first clamping block 151 is an immovable fixed part. The second clamping block 152 can move toward the first clamping block 151 and thus can clamp and fix the traction rope between the first clamping block 151 and the second clamping block 152. The wrench 153 is rotatably mounted on the bottom of the trolley body 11, and the wrench 153 has a cam portion 1531 matched with the second clamping block 152. As the wrench 153 rotates, the cam portion 1531 has a locking state in which the first and second clamping blocks fix the traction rope, and an unlocking state in which the second clamping block 152 can move away from the first clamping block 151 and the traction rope can be unlocked. The traction mechanism drives the movement of the mobile trolley 1 on the track through the traction rope fixed on the trolley body 11.

[0046] The traction mechanism in this embodiment includes a traction rope, a driving motor that drives the traction rope to move along the extension direction of the track, and a traction vehicle towed by the traction rope, and the traction vehicle is used to clamp or release the traction rope. The traction vehicle is used to move the mobile trolley when being pulled by the traction rope to move toward the direction of the sample to be tested. After the mobile trolley is pulled to a preset distance by the traction vehicle, the traction vehicle releases the traction rope and disengages from it, allowing the mobile trolley to continue to move under the action of inertia and stop through the damping mechanism; when the mobile trolley stops, the impact block moves from the base to the direction of the sample to be tested under the action of inertia, and the impact block freely flies out of the mobile trolley and hits the sample to be tested, thereby completing an impact test. The mobile trolley in this embodiment can reach a speed of 90km / h after being pulled by the traction mechanism, and the initial speed of the impact block hitting the power battery under the action of inertia can also exceed 80km / h. Compared with the impact test in the prior art, the test system of this embodiment can simulate the impact condition at a higher vehicle speed, and can more realistically complete the impact test of the bottom obstacle of the power battery, thereby improving the development of the safety performance of the power battery.

[0047] See also Figure 1 , Figure 2 and Figure 6 The damping mechanism 3 includes a crossbeam 31, a longitudinal beam 32, a damping base 33 and a damping plug 34. The left and right ends of the crossbeam 31 are respectively fixedly connected to a longitudinal beam 32, and the longitudinal beam 32 is fixed to the bottom of the barrier 4. The barrier 4 in this embodiment is a steel plate with a certain thickness, and the barrier 4 is fixed on a concrete wall 5 with sufficient strength. In some embodiments, the barrier 4 can also be a concrete wall with sufficient strength, that is, the concrete wall 5 can also serve as a barrier. The damping base 33 is fixedly mounted on the front end of the crossbeam 31, and the damping base 33 is provided with a socket portion 331 opened toward the front end of the trolley body 11. The damping plug 34 is fixed to the front end of the trolley body 11, and the damping plug 34 has a plug portion 341 matched with the socket portion 331, and the plug portion 341 can be inserted into the socket portion 331 to allow the mobile trolley 1 to achieve the purpose of deceleration and stopping movement. Preferably, a plurality of friction plates 342 are further disposed on the side of the plug portion 341 , and the friction plates 342 can increase the friction resistance between the plug portion 341 and the socket portion 331 , thereby allowing the mobile trolley 1 to stop moving more quickly.

[0048] See also Figure 7The cross beam 31 includes a bow-shaped main body 310, a fixing plate 311 for fixing and installing the damping base 33 is welded and fixed to the front end of the main body 310 facing the mobile trolley 1, and an arc structure 312 protruding toward the barrier is provided at the rear end of the main body 310 facing the barrier, and a plurality of spokes 313 are provided in the hollow part between the arc structure 312 and the main body 310 to strengthen the strength of the cross beam 31 so that the cross beam 31 will not be deformed when it is impacted and decelerated by the mobile trolley. The cross beam 31 has a fixing portion 314 at each of the two lateral ends, and a fixing hole 315 is provided on the fixing portion 314 that penetrates the fixing portion 314 in the height direction.

[0049] See also Figure 8 The longitudinal beam 32 includes a main frame 320 extending along the extension direction of the track, an upper limit plate 321 and a lower limit plate 322 are fixed to the main frame 320, and a plurality of limit holes 323 penetrating the upper limit plate 321 and the lower limit plate 322 are also provided on the main frame 320, and the plurality of limit holes 323 are arranged at intervals along the extension direction of the track. Figure 6 , the fixing parts 314 at the two lateral ends of the crossbeam 31 are respectively inserted between the upper limit plate 321 and the lower limit plate 322 of the longitudinal beam 32, and the fixing hole 315 corresponds to one of the pair of limit holes 323. At this time, the fixing pin 35 is inserted into the corresponding fixing hole 315 and the limit hole 323 to fix the crossbeam 31 to the longitudinal beam 32. When the fixing part 314 of the crossbeam 31 is in different limit holes 323 of the longitudinal beam 32, the distance between the crossbeam 31 and the barrier 4 changes accordingly, that is, the stopping point of the mobile trolley 1 also changes accordingly, which also causes the impact block on the mobile trolley 1 to fly out at different positions, and finally hits at different positions on the height of the power storage battery to be tested. The smaller the distance between the crossbeam 31 and the barrier 4, the lower the position of the impact point, and the larger the distance between the crossbeam 31 and the barrier 4, the higher the position of the impact point. Therefore, the purpose of adjusting the impact position of the power storage battery to be tested can be achieved by adjusting the position of the crossbeam 31 on the longitudinal beam 32.

[0050] See also Fig. 9The power battery fixing tool 6 includes a fixing frame 61 and a power battery mounting plate 62. The power battery mounting plate 62 is fixed to the barrier 4 through the fixing frame 61. The power battery 7 to be tested can be installed on the power battery mounting plate 62 for relevant tests. Preferably, the angle between the power battery mounting plate 62 and the horizontal plane is 20-30 degrees, more preferably 25 degrees, that is, the angle between the power battery 7 to be tested installed on the power battery mounting plate 62 and the horizontal plane is also 25 degrees. When the impact block 2 hits the power battery 7 to be tested due to inertia, the impact block 2 first hits the power battery 7 horizontally. Due to the angle setting between the power battery 7 and the horizontal plane, the impact block 2 will continue to scratch the power battery 7 along the inclined direction of the power battery 7. After scratching for a distance, the impact block 2 gradually separates from the power battery 7 due to its own gravity, so as to more realistically simulate the working condition when the power battery is scratched by the curb, thereby more realistically completing the obstacle impact test at the bottom of the battery pack and improving the safety performance development of the power battery.

[0051] See also Figure 6 and Fig. 9 The barrier 4 is provided with a plurality of fixing grooves 41, which are extended in the left-right direction. The fixing frame 61 can move in the left-right direction of the barrier through the corresponding fixing grooves 41, and the position of the power storage battery to be tested relative to the mobile trolley can be adjusted in the left-right direction, thereby changing the impact point of the impact block on the power storage battery in the left-right direction. By adjusting the position of the above-mentioned crossbeam and the position of the fixing frame, the impact position of the entire power storage battery can be basically adjusted.

[0052] The preferred embodiments of the present invention have been described in detail above, but it should be understood that after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A power battery bottom obstacle impact test system, characterized in that: include: track; A mobile trolley, the mobile trolley comprising a trolley body, a guide rail portion arranged at the bottom of the trolley body and a base arranged on the trolley body, the trolley body being movably placed on the track through the guide rail portion; A traction mechanism, the traction mechanism is connected to the mobile trolley, the traction mechanism can pull the mobile trolley to move along the track, and can release the mobile trolley; Barrier; A damping mechanism, the damping mechanism comprises a crossbeam, a pair of longitudinal beams, a damping base, a damping plug and a limit pin, the pair of longitudinal beams are respectively located on the left and right sides of the barrier, one end of the longitudinal beam is fixedly connected to the barrier, and the other end extends in a direction away from the barrier, and the longitudinal beam is provided with a plurality of pairs of limit holes arranged at intervals in the direction away from the barrier, and the left and right ends of the crossbeam are provided with fixing holes, and the limit pins are inserted into the fixing holes and the limit holes corresponding to the longitudinal beams to fix the crossbeam and the longitudinal beams; the damping base is fixed to the crossbeam, and the damping plug is fixed to the mobile trolley, and when the damping plug contacts the damping base, the mobile trolley can be turned from a moving state to a stopped state; A power battery fixing tool, the power battery fixing tool comprising a fixing frame and a power battery mounting plate, the power battery mounting plate being fixedly mounted on the barrier through the fixing frame; as well as An impact block is placed on the base of the mobile trolley, and when the mobile trolley is converted from the moving state to the stopped state, the impact block can fly out from the base to the power battery mounting plate due to inertia and hit the power battery to be tested fixed on the power battery mounting plate.

2. The power battery bottom obstacle impact test system according to claim 1, characterized in that: The barrier is provided with a plurality of fixing grooves extending in the left-right direction, and one end of the fixing frame is selectively fixed in the corresponding fixing groove.

3. The power battery bottom obstacle impact test system according to claim 1, characterized in that: The crossbeam includes a bow-shaped main part, the front end of the main part facing the mobile trolley is provided with a fixing plate for fixing the damping base, the rear end of the main part facing the barrier is provided with an arc structure protruding toward the barrier, and the hollow part between the arc structure and the main part is provided with a plurality of spokes.

4. The power battery bottom obstacle impact test system according to claim 1, characterized in that: The base includes a fixing part, a plurality of extension parts and a plurality of guide strips, the fixing part having a left side wall, a right side wall and a tail wall connected to the tail of the left side wall and the right side wall at right angles, the fixing part is fixedly connected to the trolley body, the extension part is fixed to the upper part of the left and right side walls by fixing bolts and extends vertically to the connected left or right side wall, the plurality of guide strips are extended along the direction of the track and are fixed to the inner sides of the left and right side walls of the fixing part and the inner side of the extension part by fixing bolts, and the plurality of guide strips jointly plan a space that matches the shape of the impact block.

5. The power battery bottom obstacle impact test system according to claim 4, characterized in that: The surface where the guide strip contacts the impact block is an arc-shaped curved surface.

6. The power battery bottom obstacle impact test system according to claim 4, characterized in that: The base on the trolley body includes an upper base and a lower base, both of which are located directly above the guide rails, and the upper base and the lower base are not only staggered in height but also in front-back directions.

7. The power battery bottom obstacle impact test system according to claim 1, characterized in that: The angle between the power battery mounting plate and the horizontal plane is 20-30°.

8. The power battery bottom obstacle impact test system according to claim 7, characterized in that: The angle between the power battery mounting plate and the horizontal plane is 25°.

9. The power battery bottom obstacle impact test system according to claim 1, characterized in that: The traction mechanism includes a traction rope, a driving motor that drives the traction rope to move along the extension direction of the track, and a traction vehicle that is towed by the traction rope. The traction vehicle tows the mobile trolley through the traction rope, and after the mobile trolley is towed by the traction vehicle to a preset distance, the traction vehicle releases the traction rope and disengages from the mobile trolley.

10. The power battery bottom obstacle impact test system according to claim 9, characterized in that: A traction rope fixing device is also provided at the bottom of the trolley body, and the traction rope fixing device includes a first clamp block and a second clamp block that are matched with each other. One of the first clamp block and the second clamp block can move toward the other to clamp and fix the traction rope between the first clamp block and the second clamp block.

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