Power battery bottom scraping test device and test method

Abstract

The invention relates to the technical field of battery bottom scraping test, in particular to a power battery bottom scraping test device and test method. A vehicle body is slidably mounted at the upper end of the test box; a through groove is formed in the upper end of the vehicle body; a power battery is fixedly mounted in the through groove; through the arrangement of the three groups of driving guide rails, when the vehicle body drives the power battery to move forwards, forwards turn left and forwards turn right on the three groups of driving guide rails, the bottom scraping rods located below the three groups of driving guide rails can scrape or impact the power battery in different driving directions; therefore, the scratch or impact effect of the power battery in the driving directions of advancing, forward turning and the like is simulated, the deviation of a test result is reduced, potential weak links of the power battery in actual driving are detected conveniently, and the accuracy of overall evaluation of the safety performance of the power battery is further improved. And the practical application effect of the method is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of battery bottom scraping test, in particular to a power battery bottom scraping test device and a test method. Background Art

[0002] In recent years, with the rise of a new round of scientific and technological revolution and industrial transformation, the new energy industry has entered a stage of accelerated development, and new energy vehicles have entered thousands of households. In my country, with the rapid growth of sales and ownership, electric vehicles are increasingly entering cities, rural areas and even mountains and other complex road conditions. A series of problems have also emerged during use, especially the safety of electric vehicles represented by fire accidents, which has attracted widespread attention from all walks of life. Studies have shown that damage to the battery pack caused by bottom scrapes and collisions is one of the important causes of electric vehicle fires.

[0003] In this regard, technical solutions for power battery testing have also appeared in the prior art. For example, a Chinese patent with publication number CN116879062A discloses a bottoming test method for a power battery, including: obtaining probability information of each to-be-tested area at the bottom of the power battery suffering from a bottoming accident; obtaining simulated weak point information of each to-be-tested area at the bottom of the power battery, and determining at least one bottoming test ball hitting point position based on the probability information and simulated weak point information of each to-be-tested area; initializing the power battery so that the initial performance parameters of the power battery meet a preset parameter range, and the preset parameter range is adjusted based on different bottoming test scenarios; performing a ball hitting test on the bottom of the power battery according to the bottoming test ball hitting point position; the technical solution of the embodiment of the present application can accurately select the bottoming test ball hitting point position of the bottom of the power battery to a certain extent and perform a bottoming test;

[0004] However, the ball impact test simulates impact in the vertical direction, while the power battery may be subject to scratches or impacts from different directions during actual driving, such as the forward direction, reverse direction, forward turning direction, and reverse parking. Therefore, a single ball impact test cannot reflect the multi-directional impact simulation, which will cause the damage to the battery pack when it is actually scratched or impacted to deviate from the test results. As a result, the potential weak links of the battery pack cannot be discovered during actual driving, which in turn affects the accuracy of the overall evaluation of the battery safety performance.

[0005] In view of this, in order to overcome the above technical problems, the present invention proposes a power battery bottom scraping test device and test method to solve the above technical problems. Summary of the invention

[0006] In order to make up for the shortcomings of the prior art, the present invention proposes a power battery bottom scraping test device and test method. The present invention arranges three sets of running rails, so that when the vehicle body drives the power battery to move forward, turn forward left and turn forward right on the three sets of running rails respectively, the bottom scraping rod located under the three sets of running rails can scrape or impact the power battery in different driving directions, thereby simulating the scraping or impact effect of the power battery in the driving directions of moving forward, turning forward, etc., reducing the deviation of the test results, so as to detect the potential weak links of the power battery in actual driving, thereby improving the accuracy of the overall evaluation of the safety performance of the power battery; so that the actual application effect of the present invention is effectively improved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a power battery bottom scraping test device described in the present invention comprises:

[0008] A test box; a vehicle body is slidably mounted on the upper end of the test box; a through slot is provided on the upper end of the vehicle body; a power battery is fixedly mounted in the through slot,

[0009] A ball bearing, the ball bearing is rotatably connected to the lower end of the vehicle body; an acceleration track is arranged inside the test box; the acceleration track is fixedly mounted on the bottom of the test box through a support column; the ball bearing is rollingly connected to the upper end of the acceleration track; a mounting frame is slidably mounted on one end of the test box; a traveling guide rail is arranged inside the mounting frame; the traveling guide rail is fixedly connected to the mounting frame; the mounting frame and the test box are connected by a screw helical transmission; a driving motor is fixedly mounted on the upper end of the test box; the driving motor is used to drive the screw to rotate; a scraping rod is arranged inside the mounting frame; the scraping rod is fixedly connected to the bottom of the mounting frame by a multi-section hydraulic push rod; a baffle is arranged on the side of the scraping rod away from the acceleration track; the baffle is fixedly connected to the traveling guide rail; the traveling guide rail is arranged in three groups, and the three groups of traveling guide rails are distributed up and down;

[0010] A traction unit is installed at the bottom of the test box; the traction unit is used to pull the vehicle body to move along the acceleration track.

[0011] Preferably, the traction unit comprises a traction rod; two traction rods are provided; the two traction rods are rotatably connected to support columns close to both ends of the acceleration track respectively;

[0012] The vehicle body includes a base and a frame; the ball bearing is rotatably connected to the lower end of the base; a through groove is provided at the upper end of the frame; a plug rod is fixedly connected to the upper end of the base; a slot is provided at the lower end of the frame; the traction rod and the base are connected by a steel wire rope; a servo motor is installed on one side of the traction rod; the servo motor is used to drive the traction rod to rotate.

[0013] Preferably, a rectangular groove is provided at the output end of the servo motor; a rectangular rod is slidably and sealably connected in the rectangular groove; the rectangular rod is fixedly connected to the bottom of the rectangular groove by a connecting spring; an electromagnetic sheet is inlaid at the bottom of the rectangular groove; a clamping groove matching the rectangular rod is provided at one end of the traction rod close to the mounting frame;

[0014] The output end surface of the servo motor is provided with a circular groove connected to the rectangular groove; an engaging rod is connected with a sliding seal in the circular groove; the output shaft of the servo motor is connected to the traction rod away from the mounting frame by a transmission belt; an engaging groove is provided on the inner ring wall of the transmission belt.

[0015] Preferably, a tray is provided under the acceleration track; a support rod is fixedly connected to the upper end of the tray; a connecting groove matching the support rod is provided at the lower end of the frame; an electric push rod fixedly connected to the bottom of the test box is provided under the tray; a rotating platform is provided between the electric push rod and the tray; the lower end of the rotating platform is fixedly connected to the electric push rod; and the rotating end of the rotating platform is fixedly connected to the tray.

[0016] Preferably, a groove is provided on the inner wall of the slot; a positioning rod is slidingly and sealably connected in the groove; the positioning rod is fixedly connected to the bottom of the groove by a fixing spring; an electromagnetic plate is inlaid at the bottom of the groove; and an annular groove facing the groove is provided on the surface of the support rod.

[0017] Preferably, a sliding groove is provided on the side wall of the acceleration track and the travel guide rail; a sliding rod is connected to the sliding groove in a sliding seal; a straight rod is arranged above the sliding rod; the straight rod is fixedly connected to the base; a straight groove is provided at the lower end of the straight rod; the sliding rod is slidably connected in the straight groove; a slider is connected to the sliding groove in a sliding seal; the sliding rod and the slider are connected by a supporting spring; the slider and the straight rod are connected by a screw rod.

[0018] Preferably, elastic blocks are fixedly connected to both ends of the frame; the elastic blocks are made of silicone material.

[0019] A power battery bottom scraping test method, which is applicable to the power battery bottom scraping test device mentioned above, and the steps of the method are as follows:

[0020] S1: Battery installation: first install the power battery in the through slot of the frame, then control the drive motor to drive the mounting frame to drive the used travel rail to connect with the acceleration rail, and finally control the multi-section hydraulic push rod to push the bottom scraper rod to the specified height;

[0021] S2: Simulating vehicle weight: The user rotates the lead screw so that the lead screw can spirally extend out of the straight slot, so that the lead screw pulls the slider connected to it to move along the straight slot away from the slide bar, so that the slider can pull the support spring to extend, so that the contraction restoring force of the support spring increases, so that the support spring will pull the base and the acceleration track tightly under the action of the restoring force, so that the pressure applied by the base to the acceleration track is the pressure applied by the vehicle weight on the ground;

[0022] S3: Battery scraping test: Control the servo motor to drive the traction rod near the mounting frame to rotate, so that the traction rod near the mounting frame pulls the frame through the wire rope to drive the power battery to move along the acceleration track to the travel guide rail, so that the frame drives the power battery to collide with the scraping rod at the travel guide rail;

[0023] S4: Car body return: After the power battery scrapes the bottom and collides, first control the multi-section hydraulic push rod to pull the scraping rod down, and then control the traction rod away from the mounting frame to rotate, so that the traction rod away from the mounting frame pulls the car body to the end of the acceleration track away from the mounting frame through the wire rope;

[0024] S5: Battery steering: When the traction rod away from the mounting frame pulls the vehicle body to the top of the pallet, the electric push rod is controlled to push the pallet up and connect it to the frame, and the electromagnetic plate is controlled to be energized to make the positioning rod extend out of the annular groove on the surface of the support rod, so that the electric push rod pushes the frame to separate from the base through the pallet, and then the rotating platform is controlled to drive the frame to rotate through the pallet, so that the rear end of the power battery rotates to the front end, and the rear end of the power battery is scraped to the bottom test;

[0025] S6: Battery evaluation: After completing the power battery scraping test, the power battery will be removed from the frame and transported to the evaluation center for risk assessment of the power battery after scraping and recording of the results, and the battery health status will be confirmed based on subsequent tests.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1. The present invention arranges three sets of running rails so that when the vehicle body drives the power battery to move forward, turn left and turn right on the three sets of running rails respectively, the scraper rods located under the three sets of running rails can scrape or impact the power battery in different driving directions, thereby simulating the scraping or impact effects of the power battery in the driving directions of moving forward, turning forward, etc., reducing the deviation of the test results, so as to detect the potential weak links of the power battery in actual driving, and further improve the accuracy of the overall evaluation of the safety performance of the power battery; so that the actual application effect of the present invention is effectively improved.

[0028] 2. The present invention cooperates with the tray and the rotating platform so that the rotating platform can drive the frame to drive the power battery to rotate through the tray, so that the frame drives the scratched and impacted power battery to rotate, and the rear end of the power battery rotates to the front end. When the frame drives the power battery to scratch again, the rear end of the power battery can perform a scratch and impact test with the scraper bar to simulate the power battery being scratched or impacted in the driving direction of reversing and reversing into a warehouse, thereby further improving the accuracy of the overall evaluation of the safety performance of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0030] Figure 1 is a stereogram of the present invention;

[0031] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0032] Figure 3 It is a partial structural schematic diagram of the present invention;

[0033] Figure 4 It is a transmission stereogram of the traction rod used in the present invention;

[0034] Figure 5 yes Figure 4 The enlarged view of point B in the middle;

[0035] Figure 6 It is a schematic diagram of the partial structure of the vehicle body used in the present invention;

[0036] Figure 7 yes Figure 6 Enlarged view of point C in the middle;

[0037] Figure 8 is a flow chart of the method of the present invention;

[0038] In the figure: 1, test box; 11, acceleration track; 111, support column; 12, mounting frame; 121, travel guide rail; 122, screw; 123, drive motor; 13, scraper rod; 131, multi-section hydraulic push rod; 132, baffle; 14, traction rod; 141, wire rope; 142, servo motor; 143, card slot; 15, rectangular slot; 151, rectangular rod; 152, connecting spring; 153, electromagnetic sheet; 16, round slot; 161, meshing rod; 162, transmission belt; 163, meshing slot; 1 7. Slide groove; 18. Slide rod; 181. Straight rod; 182. Straight groove; 183. Sliding block; 184. Support spring; 185. Screw rod; 2. Car body; 21. Through groove; 22. Ball bearing; 23. Base; 231. Insert rod; 24. Car frame; 241. Slot; 242. Connecting groove; 25. Tray; 251. Support rod; 252. Rotating platform; 253. Electric push rod; 26. Groove; 261. Fixed spring; 262. Electromagnetic plate; 263. Annular groove; 264. Positioning rod; 27. Elastic block. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0040] like Figures 1 to 8 As shown, a power battery bottom scraping test device according to the present invention comprises:

[0041] A test box 1; a vehicle body 2 is slidably mounted on the upper end of the test box 1; a through slot 21 is provided on the upper end of the vehicle body 2; a power battery is fixedly mounted in the through slot 21,

[0042] The ball 22 is rotatably connected to the lower end of the vehicle body 2; the test box 1 is provided with an acceleration track 11; the acceleration track 11 is fixedly installed at the bottom of the test box 1 through a support column 111; the ball 22 is rollingly connected to the upper end of the acceleration track 11; a mounting frame 12 is slidably installed at one end of the test box 1; a travel guide rail 121 is provided inside the mounting frame 12; the travel guide rail 121 is fixedly connected to the mounting frame 12; a screw 122 is spirally transmitted between the mounting frame 12 and the test box 1 Dynamic connection; a driving motor 123 is fixedly installed on the upper end of the test box 1; the driving motor 123 is used to drive the screw 122 to rotate; a bottom scraping rod 13 is arranged inside the mounting frame 12; the bottom scraping rod 13 is fixedly connected to the bottom of the mounting frame 12 through a multi-section hydraulic push rod 131; a baffle 132 is arranged on the side of the bottom scraping rod 13 away from the acceleration track 11; the baffle 132 is fixedly connected to the travel guide rail 121; the travel guide rail 121 is provided with three groups, and the three groups of the travel guide rails 121 are distributed up and down;

[0043] A traction unit is installed at the bottom of the test box 1 ; the traction unit is used to pull the vehicle body 2 to move along the acceleration track 11 .

[0044] As an embodiment of the present invention, the traction unit includes a traction rod 14; two traction rods 14 are provided; the two traction rods 14 are rotatably connected to support columns 111 close to both ends of the acceleration track 11 respectively;

[0045] The vehicle body 2 includes a base 23 and a frame 24; the ball bearing 22 is rotatably connected to the lower end of the base 23; a through groove 21 is provided at the upper end of the frame 24; a plug rod 231 is fixedly connected to the upper end of the base 23; a slot 241 is provided at the lower end of the frame 24; the traction rod 14 and the base 23 are connected by a steel wire rope 141; a servo motor 142 is installed on one side of the traction rod 14; the servo motor 142 is used to drive the traction rod 14 to rotate.

[0046] As an embodiment of the present invention, a rectangular groove 15 is provided at the output end of the servo motor 142; a rectangular rod 151 is slidably and sealably connected in the rectangular groove 15; the rectangular rod 151 is fixedly connected to the bottom of the rectangular groove 15 by a connecting spring 152; an electromagnetic sheet 153 is inlaid at the bottom of the rectangular groove 15; a card slot 143 matching with the rectangular rod 151 is provided at one end of the traction rod 14 close to the mounting frame 12;

[0047] The output end surface of the servo motor 142 is provided with a circular groove 16 connected to the rectangular groove 15; an engaging rod 161 is slidably sealed and connected in the circular groove 16; the output shaft of the servo motor 142 is connected to the traction rod 14 away from the mounting frame 12 by a transmission belt 162; an engaging groove 163 is provided in the inner ring wall of the transmission belt 162;

[0048] During operation, the power battery may be subject to scratches or impacts from different directions during actual driving, such as when the electric vehicle is moving forward, turning forward, etc. Therefore, a single ball impact test cannot reflect the impact simulation in multiple directions, which will cause the damage to the power battery when it is actually scratched or impacted to deviate from the test results; thus, the potential weak links of the power battery in actual driving cannot be discovered, which in turn affects the accuracy of the overall evaluation of the battery safety performance;

[0049] In this regard, the present invention provides three sets of travel guide rails 121, so that when the vehicle body 2 drives the power battery to move forward, turn left and turn right on the three sets of travel guide rails 121, the scraper rod 13 located below the three sets of travel guide rails 121 can scrape or impact the power battery in different driving directions, thereby simulating the scraping or impact effect of the power battery in the driving directions of moving forward, turning forward, etc., reducing the deviation of the test results, so as to detect the potential weak links of the power battery in actual driving, thereby improving the accuracy of the overall evaluation of the safety performance of the power battery; so that the actual application effect of the present invention is effectively improved;

[0050] In the initial state, the three groups of running guide rails 121 are distributed up and down, the direction of the top group of running guide rails 121 is forward and left turn, the direction of the middle group of running guide rails 121 is forward, and the direction of the group of running guide rails 121 located directly below is forward and right turn, and the surface of the traction rod 14 far away from the mounting frame 12 is fixedly connected with a protrusion; the traction rod 14 far away from the mounting frame 12 is engaged with the engagement groove 163 of the inner ring wall of the transmission belt 162 through the protrusion on the surface; the user first fixes the power battery in the through groove 21 at the upper end of the frame 24; so that the lower end of the power battery is exposed from the through groove 21 and is located below the frame 24; then select the required running guide rail 121 according to the needs, if it is necessary to detect that the power battery is scratched or impacted in the forward left turn driving direction, it is only necessary to control the drive motor 123 The drive motor 123 is operated so that the screw rod 122 can rotate, so that the screw rod 122 drives the mounting frame 12 which is slidably connected with the test box 1 to descend until the travel guide rail 121 located directly above the mounting frame 12 contacts the acceleration track 11; so that the travel guide rail 121 located directly above the mounting frame 12 is in an aligned connection state with the acceleration track 11; then the multi-section hydraulic push rod 131 is controlled to operate so that the multi-section hydraulic push rod 131 can push the bottom scraping rod 13 to rise to a specified height, so that the bottom scraping rod 13 slides in contact with the baffle plate 132 fixed to the lower end of the travel guide rail, so that the baffle plate 132 can block the impacted bottom scraping rod 13, so as to prevent the bottom scraping rod 13 from causing deformation of the multi-section hydraulic push rod 131 at the lower end due to the impact, thereby improving the service life of the multi-section electric push rod 253;

[0051] The driving motor 123 is controlled to stop, and then the electromagnetic sheet 153 is controlled to generate a magnetic adsorption force on the rectangular rod 151, so that the rectangular rod 151 presses the connecting spring 152 into the rectangular groove 15 under the action of the magnetic adsorption force, so that the rectangular rod 151 extends out of the slot 143, so that the servo motor 142 is no longer connected to the traction rod 14 close to the mounting frame 12 through the rectangular rod 151;Since the rectangular groove 15 is filled with hydraulic oil, the rectangular rod 151 entering the rectangular groove 15 can squeeze the hydraulic oil in the rectangular groove 15 into the circular groove 16, so that the meshing rod 161 in the circular groove 16 is pushed by the hydraulic oil to extend out of the circular groove 16 and insert into the meshing groove 163 of the inner ring wall of the transmission belt 162, so that the output shaft of the servo motor 142 is meshed with the meshing groove 163 through the meshing rod 161, and then the servo motor 142 is controlled to run, so that the servo motor 142 can drive the traction rod 14 away from the mounting frame 12 to rotate through the transmission belt 162, so that during the rotation of the traction rod 14 away from the mounting frame 12, the traction rod 14 can pull the base 23 to a direction away from the mounting frame 12 through the wire rope 141. The base 23 drives the power battery on the frame 24 to move to the end of the test box 1 away from the mounting bracket 12, and then the electromagnetic sheet 153 is controlled to be powered off, so that the electromagnetic sheet 153 no longer generates magnetic adsorption force on the rectangular rod 151, so that the rectangular rod 151 can extend out of the rectangular slot 15 and move toward the direction close to the slot 143 under the push of the restoring force of the connecting spring 152, until the rectangular rod 151 contacts the traction rod 14 close to the mounting bracket 12. At this time, the servo motor 142 is controlled to run, so that the servo motor 142 can drive the rectangular rod 151 to rotate, until the rectangular rod 151 is directly opposite to the slot 143, so that the rectangular rod 151 can be inserted into the slot 143, and the output shaft of the servo motor 142 passes through the rectangular slot 153. The rectangular rod 151 is connected to the traction rod 14 near the mounting frame 12, and then the servo motor 142 is controlled to operate, so that the servo motor 142 drives the traction rod 14 near the mounting frame 12 to rotate through the rectangular rod 151, so that the traction rod 14 can wrap the steel wire rope 141 connected thereto around its surface during the rotation process, so that the traction rod 14 near the mounting frame 12 can pull the vehicle body 2 toward the mounting frame 12 through the steel wire rope 141. By controlling the rotation speed of the servo motor 142, the winding speed of the steel wire rope 141 is controlled, thereby controlling the speed at which the steel wire rope 141 pulls the vehicle body 2 to move on the acceleration track 11, so that the vehicle body 2 can move toward the mounting frame 12 at a speed of 30-31 km / h. The vehicle body 2 moves in the direction of the mounting frame 12 until the vehicle body 2 moves to the top of the traction rod 14 near the mounting frame 12. At this time, the servo motor 142 is controlled to rotate in the opposite direction, so that the wire rope 141 on the surface of the traction rod 14 is released. After the vehicle body 2 passes the traction rod 14 near the mounting frame 12, it will pass through the acceleration track 11 to a group of travel guide rails 121 located at the top of the mounting frame 12, so that the vehicle body 2 on the travel guide rails 121 is in a left turn state, until the power battery on the vehicle body 2 contacts the bottom scraping rod 13 at the travel guide rail 121, so that the power battery collides with the bottom scraping rod 13 at a speed of 30-31 km / h, thereby detecting the degree of damage to the power battery when it is scraped or impacted in the left turn state;When the collision is over, the multi-section hydraulic push rod 131 is controlled to pull the scraper rod 13 down, and then the electromagnetic sheet 153 is controlled to be energized again, so that the electromagnetic sheet 153 absorbs the rectangular rod 151 to squeeze the hydraulic oil in the rectangular groove 15 to push the meshing rod 161 to mesh with the meshing groove 163 on the inner wall of the transmission belt 162, so that the servo motor 142 can drive the traction rod 14 away from the mounting frame 12 to wind the wire rope 141, so that the wire rope 141 pulls the vehicle body 2 through the travel guide rail 121 to the acceleration track 11, and finally is pulled to the end of the acceleration track 11 away from the mounting frame 12, and then the user removes the power battery and tests and evaluates the safety performance of the power battery after being scratched or impacted in the left turning direction. If it is necessary to test the power battery when the car is moving forward or moving forward in the right turning direction and is impacted and scraped, then If a new power battery needs to be installed, the driving motor 123 is controlled to drive the mounting frame 12 to rise, so that the mounting frame 12 drives a set of linear travel guide rails 121 in the middle to connect with the acceleration track 11, so as to detect the impact of the power battery being scratched or impacted in the forward direction on the safety performance of the power battery. If the lowest travel guide rail is controlled to connect with the acceleration track 11, the impact of the power battery being scratched or impacted in the forward right turning direction on the safety performance of the power battery is detected; thereby simulating the scratching or impact effect of the power battery in the forward, forward turning and other driving directions, reducing the deviation of the test results, so as to detect the potential weak links of the power battery in actual driving, thereby improving the accuracy of the overall evaluation of the safety performance of the power battery; so that the actual application effect of the present invention is effectively improved. ;

[0052] As an embodiment of the present invention, a tray 25 is arranged below the acceleration track 11; a support rod 251 is fixedly connected to the upper end of the tray 25; a connecting groove 242 matching the support rod 251 is opened at the lower end of the frame 24; an electric push rod 253 fixedly connected to the bottom of the test box 1 is arranged below the tray 25; a rotating platform 252 is arranged between the electric push rod 253 and the tray 25; the lower end of the rotating platform 252 is fixedly connected to the electric push rod 253; the rotating end of the rotating platform 252 is fixedly connected to the tray 25.

[0053] As an embodiment of the present invention, a groove 26 is formed on the inner wall of the slot 241; a positioning rod 264 is slidably and sealably connected in the groove 26; the positioning rod 264 is fixedly connected to the bottom of the groove 26 by a fixing spring 261; an electromagnetic plate 262 is inlaid on the bottom of the groove 26; and an annular groove 263 facing the groove 26 is formed on the surface of the support rod 251;

[0054] During operation, usually, after a battery has been subjected to a scratch or impact test in one direction, a new power battery needs to be replaced to ensure that each test reflects the battery performance in the initial state as much as possible; in fact, the power battery is designed to withstand multiple impacts and scratches without affecting its performance and safety, so if the power battery is tested to withstand multiple impacts and scratches without affecting its performance and safety, the power battery will not be replaced and the test in the next direction will be carried out; in addition, during actual driving, the power battery will also be subject to scratches or impacts in the driving direction of reversing and reversing into the garage;

[0055] When the traction rod 14 away from the mounting frame 12 pulls the vehicle body 2 that has completed the power battery bottom scraping test to the end of the acceleration track 11 away from the mounting frame 12 through the wire rope 141, at this time, the base 23 of the vehicle body 2 is located directly above the tray 25, and the electromagnetic plate 262 is controlled to be energized so that the electromagnetic plate 262 can generate a magnetic adsorption force on the positioning rod 264, so that the positioning rod 264 squeezes the fixing spring 261 into the groove 26 under the action of the magnetic adsorption force of the electromagnetic plate 262, so that the positioning rod 264 will not extend out of the groove 26 into the slot 241 and block the insertion rod 231; then the electric push rod 253 is controlled to push the tray 25 up and approach the upper base 23, and the tray 25 drives the upper support rod 251 to rise until the support rod 251 is inserted The connecting groove 242 at the lower end of the base 23 allows the support rod 251 to be connected to the base 23 through the connecting groove 242. As the electric push rod 253 continues to push the tray 25 up, the tray 25 pushes the frame 24 up through the support rod 251, so that the insertion rod 231 at the upper end of the base 23 continues to extend out of the slot 241 until the insertion rod 231 completely extends out of the slot 241, so that the frame 24 is separated from the base 23. At this time, the rotating platform 252 is controlled to operate, so that the rotating end on the rotating platform 252 drives the tray 25 fixed thereto to rotate, so that the tray 25 drives the frame 24 to rotate, so that the frame 24 can drive the power battery to rotate 180 degrees, so that the power battery is away from the rear end of the mounting frame 12 and rotates to the front of the base 23 close to the mounting frame 12. The push rod 231 is at the end, at this time, the insertion rod 231 is directly opposite to the slot 241, and then the electric push rod 253 is controlled to descend, so that the electric push rod 253 can pull the tray 25 down, so that the tray 25 drives the frame 24 to descend, until the insertion rod 231 at the upper end of the base 23 is inserted into the slot 241. As the electric push rod 253 continues to shrink, the base 23 and the frame 24 are connected again, so that the electric push rod 253 can pull the tray 25 down, so that the tray 25 drives the supporting rod 251 to descend and separate from the frame 24; and when the insertion rod 231 is fully inserted into the slot 241 again, the annular groove 263 on the surface of the insertion rod 231 is directly opposite to the groove 26, and the electromagnetic plate 262 is controlled to be powered off, so that the positioning rod 264 can extend out of the groove under the push of the restoring force of the fixing spring 261 The groove 26 enters the connecting groove 242, so that the positioning rod 264 entering the connecting groove 242 can be inserted into the annular groove 263 on the surface of the insertion rod 231, so that the positioning rod 264 fixes the insertion rod 231 in the slot 241 through the annular groove 263 on the surface of the insertion rod 231, thereby completing the fixed connection between the frame 24 and the base 23, and preventing the frame 24 from driving the power battery to scrape or impact the bottom scraping rod 13, and the impacted power battery pushes the frame 24 and the base 23 to separate under the blocking force of the bottom scraping rod 13, thereby ensuring that the frame 24 can be stably connected to the base 23, so as to ensure that the power battery is stably scraped or impacted by the bottom scraping rod 13, thereby improving the scraping or impact effect of the bottom scraping rod 13 on the power battery, and ensuring the accuracy of the test results;Then, the traction rod 14 near the mounting frame 12 is controlled to traction the base 23 to drive the rear end of the power battery after the first scrape to perform a second scrape impact test, so as to detect and evaluate the performance and safety of the power battery after multiple impacts and scrapes, thereby improving the accuracy of the overall evaluation of the safety performance of the power battery; so that the practical application effect of the present invention is effectively improved;

[0056] To this end, the present invention cooperates with the tray 25 and the rotating platform 252 so that the rotating platform 252 can drive the frame 24 to drive the power battery to rotate through the tray 25, so that the frame 24 drives the scratched and impacted power battery to rotate, and the rear end of the power battery rotates to the front end. When the frame 24 drives the power battery to be scratched again, the rear end of the power battery can be subjected to a scratch and impact test with the scraper rod 13 to simulate the power battery being scratched or impacted in the driving direction of reversing and reversing into a warehouse, thereby further improving the accuracy of the overall evaluation of the safety performance of the power battery.

[0057] As an embodiment of the present invention, a slide groove 17 is provided on the side wall of the acceleration track 11 and the travel guide rail 121; a slide rod 18 is slidably and sealedly connected in the slide groove 17; a straight rod 181 is arranged above the slide rod 18; the straight rod 181 is fixedly connected to the base 23; a straight groove 182 is provided at the lower end of the straight rod 181; the slide rod 18 is slidably connected in the straight groove 182; a slider 183 is slidably and sealedly connected in the straight groove 182; the slide rod 18 and the slider 183 are connected via a support spring 184; the slider 183 and the straight rod 181 are connected via a screw rod 185.

[0058] As an embodiment of the present invention, elastic blocks 27 are fixedly connected to both ends of the frame 24; the elastic blocks 27 are made of silicone material;

[0059] During operation, when the power battery is subjected to an actual bottom scraping test, the body weight of the vehicle will generate additional pressure on the bottom of the power battery; when the bottom of the power battery is impacted, this part of the pressure will act together with the impact force on the power battery structure, which may aggravate the degree of damage to the power battery. The body 2 gravity is adjusted, and the power battery is subjected to the body weight when it is scraped or impacted; in the initial state, the slider 183 is rotatably connected to the screw rod 185, and the screw rod 185 is spirally threadedly connected to the straight rod 181. For this purpose, the present invention sets the cooperation between the straight rod 181 and the slider 18. When it is necessary to simulate the increase of the body gravity and the power battery is scratched or impacted, the user only needs to rotate the screw rod 1 85, so that the screw rod 185 is rotated and continuously extends out of the straight groove 182, so that the screw rod 185 pulls the slider 183 connected to it for rotation to move upward, so that the slider 183 can pull the support spring 184 to stretch, so that the contraction recovery force of the support spring 184 increases, so that the support spring 184 will pull the base 23 and the acceleration track 11 to press against each other through the slider 183 and the screw rod 185, so that the pressure exerted by the base 23 and the acceleration track 11 increases, and when the power battery is scraped or impacted by the scraping rod 13, the scraping rod 13 has a supporting effect on the power battery, so the power battery will drive the base 23 connected to the frame 24 to have an upward trend under the supporting effect; The rod 18 is connected to the base 23, and the support spring 184 generates a downward pulling force on the base 23. Because the pulling force of the support spring 184 is opposite to the supporting effect of the scraping rod 13, the support spring 184 exerts a pulling force on the base 23. At this time, the pressure exerted by the base 23 on the acceleration track 11 is the pressure exerted by the weight of the vehicle on the ground, thereby simulating the gravity of the vehicle body; ensuring that the performance of the power battery under pressure and impact is closer to the actual situation when the vehicle is driving, thereby more accurately evaluating the performance and safety of the battery under real use conditions, so that the practical application effect of the present invention is further improved; in addition, the base 23 is slidably connected to the acceleration track 11 through the straight rod 181 The base 23 is in the slide groove 17 of the side wall of the track 11 and the running guide rail 121, so that the base 23 can be tightly connected with the acceleration track 11 and the running guide rail 121, especially when detecting forward left turn and forward right turn, to prevent the base 23 from being separated from the acceleration track 11 and the running guide rail 121 due to scratches and impacts, thereby preventing the base 23 from carrying the power battery and falling off, ensuring that the base 23 can be stably connected to the acceleration track 11 and the running guide rail 121; thereby ensuring that the power battery is only scratched and impacted by the bottom scraping rod 13, rather than being affected by other impacts, ensuring the accuracy of the power battery bottom scraping test, and further improving the accuracy of the overall evaluation of the safety performance of the power battery;

[0060] The elastic blocks 27 made of silicone material are fixed at both ends of the vehicle frame 24 in order to prevent the vehicle body 2 from driving the power battery only to be scraped and impacted by the scraping rod 13. Under the action of inertia, the vehicle body 2 moves along the guide rail to the end of the mounting frame 12 away from the acceleration track 11, so that the vehicle body 2 can contact the end of the mounting frame 12 away from the acceleration track 11 through the elastic blocks 27, so that the elastic blocks 27 can be squeezed and deformed by the collision, so that the elastic blocks 27 buffer the vehicle body 2 to prevent the vehicle body 2 from colliding with the elastic mounting frame 12, and avoid additional damage to the power battery due to the collision impact, thereby further ensuring the accuracy of the power battery scraping test and further improving the practical application effect of the present invention.

[0061] A power battery bottom scraping test method, which is applicable to the power battery bottom scraping test device mentioned above, and the steps of the method are as follows:

[0062] S1: Battery installation: first install the power battery in the through slot 21 of the frame 24, then control the drive motor 123 to drive the mounting frame 12 to drive the used travel rail to connect with the acceleration track 11, and finally control the multi-section hydraulic push rod 131 to push the bottom scraping rod 13 up to the specified height;

[0063] S2: Simulating vehicle weight: The user rotates the screw rod 185 so that the screw rod 185 can spirally extend out of the straight groove 182, so that the screw rod 185 pulls the slider 183 rotatably connected thereto to move along the straight groove 182 away from the slide bar 18, so that the slider 183 can pull the support spring 184 to extend, so that the contraction restoring force of the support spring 184 increases, so that the support spring 184 will pull the base 23 and the acceleration track 11 tightly under the action of the restoring force, so that the pressure applied by the base 23 to the acceleration track 11 is the pressure applied by the vehicle weight on the ground;

[0064] S3: Battery scraping test: Control the servo motor 142 to drive the traction rod 14 near the mounting frame 12 to rotate, so that the traction rod 14 near the mounting frame 12 pulls the frame 24 through the wire rope 141 to drive the power battery to move along the acceleration track 11 to the travel guide rail, so that the frame 24 drives the power battery to collide with the scraping rod 13 at the travel guide rail;

[0065] S4: Return of the vehicle body 2: After the power battery scrapes the bottom and collides, the multi-section hydraulic push rod 131 is controlled to pull the scraping rod 13 downward, and then the traction rod 14 away from the mounting frame 12 is controlled to rotate, so that the traction rod 14 away from the mounting frame 12 pulls the vehicle body 2 to the end of the acceleration track 11 away from the mounting frame 12 through the steel wire rope 141;

[0066] S5: Battery steering: When the traction rod 14 away from the mounting frame 12 pulls the vehicle body 2 to the top of the tray 25, the electric push rod 253 is controlled to push the tray 25 up and connect it to the vehicle frame 24, and the electromagnetic plate 262 is controlled to be energized, so that the positioning rod 264 extends out of the annular groove 263 on the surface of the support rod 251, so that the electric push rod 253 pushes the vehicle frame 24 to separate from the base 23 through the tray 25, and then the rotating platform 252 is controlled to drive the vehicle frame 24 to rotate through the tray 25, so that the rear end of the power battery rotates to the front end, and the rear end of the power battery is scraped to the bottom test;

[0067] S6: Battery evaluation: After completing the power battery scraping test, the power battery is removed from the frame 24 and transported to the evaluation center for risk assessment of the power battery after scraping and recording of the results, and the battery health status is confirmed based on subsequent tests.

[0068] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A power battery bottom scraping test device, comprising: A test box (1); a vehicle body (2) is slidably mounted on the upper end of the test box (1); a through slot (21) is provided on the upper end of the vehicle body (2); a power battery is fixedly mounted in the through slot (21), characterized in that: A ball (22) is rotatably connected to the lower end of the vehicle body (2); an acceleration track (11) is arranged inside the test box (1); the acceleration track (11) is fixedly installed at the bottom of the test box (1) through a support column (111); the ball (22) is rollingly connected to the upper end of the acceleration track (11); a mounting frame (12) is slidably installed at one end of the test box (1); a travel guide rail (121) is arranged inside the mounting frame (12); the travel guide rail (121) is fixedly connected to the mounting frame (12); a screw rod (122) is used between the mounting frame (12) and the test box (1). The test box (1) is connected by a screw transmission; a driving motor (123) is fixedly mounted on the upper end of the test box (1); the driving motor (123) is used to drive the screw rod (122) to rotate; a bottom scraping rod (13) is arranged inside the mounting frame (12); the bottom scraping rod (13) is fixedly connected to the bottom of the mounting frame (12) via a multi-section hydraulic push rod (131); a baffle (132) is arranged on the side of the bottom scraping rod (13) away from the acceleration track (11); the baffle (132) is fixedly connected to the travel guide rail (121); the travel guide rail (121) is provided with three groups, and the three groups of the travel guide rails (121) are distributed up and down; A traction unit is installed at the bottom of the test box (1); the traction unit is used to pull the vehicle body (2) to move along the acceleration track (11).

2. A power battery bottom scraping test device according to claim 1, characterized in that: The traction unit comprises a traction rod (14); two traction rods (14) are provided; the two traction rods (14) are rotatably connected to support columns (111) respectively close to two ends of the acceleration track (11); The vehicle body (2) comprises a base (23) and a frame (24); the ball bearing (22) is rotatably connected to the lower end of the base (23); a through slot (21) is provided at the upper end of the frame (24); an insertion rod (231) is fixedly connected to the upper end of the base (23); a slot (241) is provided at the lower end of the frame (24); the traction rod (14) and the base (23) are connected via a steel wire rope (141); a servo motor (142) is installed on one side of the traction rod (14); the servo motor (142) is used to drive the traction rod (14) to rotate.

3. A power battery bottom scraping test device according to claim 2, characterized in that: The output end of the servo motor (142) is provided with a rectangular groove (15); a rectangular rod (151) is slidably sealed in the rectangular groove (15); the rectangular rod (151) is fixedly connected to the bottom of the rectangular groove (15) via a connecting spring (152); an electromagnetic sheet (153) is embedded in the bottom of the rectangular groove (15); a clamping groove (143) matching with the rectangular rod (151) is provided at one end of the traction rod (14) close to the mounting frame (12); The output end surface of the servo motor (142) is provided with a circular groove (16) which is connected to the rectangular groove (15); an engaging rod (161) is slidably sealed in the circular groove (16); the output shaft of the servo motor (142) is connected to a traction rod (14) away from the mounting frame (12) by a belt transmission via a transmission belt (162); and an engaging groove (163) is provided on the inner ring wall of the transmission belt (162).

4. A power battery bottom scraping test device according to claim 3, characterized in that: A tray (25) is arranged below the acceleration track (11); a support rod (251) is fixedly connected to the upper end of the tray (25); a connecting groove (242) matching with the support rod (251) is provided at the lower end of the vehicle frame (24); an electric push rod (253) fixedly connected to the bottom of the test box (1) is arranged below the tray (25); a rotating platform (252) is arranged between the electric push rod (253) and the tray (25); the lower end of the rotating platform (252) is fixedly connected to the electric push rod (253); and the rotating end of the rotating platform (252) is fixedly connected to the tray (25).

5. A power battery bottom scraping test device according to claim 4, characterized in that: The inner wall of the slot (241) is provided with a groove (26); a positioning rod (264) is slidably sealed in the groove (26); the positioning rod (264) is fixedly connected to the bottom of the groove (26) via a fixing spring (261); an electromagnetic plate (262) is inlaid at the bottom of the groove (26); and an annular groove (263) facing the groove (26) is provided on the surface of the support rod (251).

6. A power battery bottom scraping test device according to claim 5, characterized in that: The acceleration track (11) and the side wall of the travel guide rail (121) are provided with a slide groove (17); a slide rod (18) is slidably sealed in the slide groove (17); a straight rod (181) is arranged above the slide rod (18); the straight rod (181) is fixedly connected to the base (23); a straight groove (182) is provided at the lower end of the straight rod (181); the slide rod (18) is slidably connected in the straight groove (182); a slider (183) is slidably sealed in the straight groove (182); the slide rod (18) and the slider (183) are connected via a support spring (184); the slider (183) and the straight rod (181) are connected via a screw rod (185).

7. A power battery bottom scraping test device according to claim 6, characterized in that: Elastic blocks (27) are fixedly connected to both ends of the vehicle frame (24); the elastic blocks (27) are made of silicone material.

8. A power battery bottom scraping test method, the method is applicable to a power battery bottom scraping test device as claimed in claim 7, characterized in that: The steps of this method are as follows: S1: Battery installation: first install the power battery in the through slot (21) of the frame (24), then control the drive motor (123) to drive the mounting frame (12) to drive the used travel rail to connect with the acceleration track (11), and finally control the multi-section hydraulic push rod (131) to push the bottom scraping rod (13) to rise to a specified height; S2: Simulating vehicle weight: The user rotates the screw rod (185) so that the screw rod (185) can spirally extend out of the straight groove (182), so that the screw rod (185) pulls the slider (183) rotatably connected thereto to move along the straight groove (182) away from the slide bar (18), so that the slider (183) can pull the support spring (184) to extend, so that the contraction restoring force of the support spring (184) increases, so that the support spring (184) will pull the base (23) and the acceleration track (11) to press against each other under the action of the restoring force, so that the pressure applied by the base (23) to the acceleration track (11) is the pressure applied by the vehicle weight to the ground; S3: Battery scraping test: Control the servo motor (142) to drive the traction rod (14) near the mounting frame (12) to rotate, so that the traction rod (14) near the mounting frame (12) pulls the frame (24) through the wire rope (141) to drive the power battery to move along the acceleration track (11) to the travel guide rail, so that the frame (24) drives the power battery to collide with the scraping rod (13) at the travel guide rail; S4: Return of the vehicle body (2): After the power battery scrapes the bottom and collides, the multi-section hydraulic push rod (131) is first controlled to pull the scraping rod (13) downward, and then the traction rod (14) away from the mounting frame (12) is controlled to rotate, so that the traction rod (14) away from the mounting frame (12) pulls the vehicle body (2) to the end of the acceleration track (11) away from the mounting frame (12) through the steel wire rope (141); S5: Battery steering: When the traction rod (14) away from the mounting frame (12) pulls the vehicle body (2) to the top of the tray (25), the electric push rod (253) is controlled to push the tray (25) up and connect it to the vehicle frame (24), and the electromagnetic plate (262) is controlled to be energized, so that the positioning rod (264) extends out of the annular groove (263) on the surface of the support rod (251), so that the electric push rod (253) pushes the vehicle frame (24) to separate from the base (23) through the tray (25), and then the rotating platform (252) is controlled to drive the vehicle frame (24) to rotate through the tray (25), so that the rear end of the power battery rotates to the front end, and the rear end of the power battery is scraped to the bottom test; S6: Battery evaluation: After completing the power battery scraping test, the power battery is removed from the vehicle frame (24) and transported to an evaluation center for risk evaluation of the power battery after scraping and recording of the results, and confirming the battery health status based on subsequent tests.

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