CN113093032A - Electric vehicle battery pack bottom supporting test bench and test method - Google Patents
Electric vehicle battery pack bottom supporting test bench and test method Download PDFInfo
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- CN113093032A CN113093032A CN202110340063.1A CN202110340063A CN113093032A CN 113093032 A CN113093032 A CN 113093032A CN 202110340063 A CN202110340063 A CN 202110340063A CN 113093032 A CN113093032 A CN 113093032A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- 238000007790 scraping Methods 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 abstract description 7
- 238000009863 impact test Methods 0.000 description 10
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- 210000001503 joint Anatomy 0.000 description 2
- 238000011076 safety test Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
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Abstract
The invention discloses a bottom supporting test bed frame for a battery pack of an electric automobile, which comprises a battery pack assembling table for installing the battery pack, a lifting machine for controlling the battery pack to lift and enabling the battery pack to rise to a target height, a bottom supporting test bed for receiving the battery pack at the target height and carrying out a bottom supporting test on the battery pack, and a safety pool for receiving the battery pack from the bottom supporting test bed and processing the battery pack with abnormal conditions in the test process. The electric automobile battery pack bottom support test bench can simulate two working conditions of bottom cutting and bottom collision during bottom supporting of an electric automobile, is closer to the actual use condition of the electric automobile, and can detect whether the performance of a battery pack under the working conditions of bottom cutting and bottom collision meets the design requirement. The invention also discloses a bottom supporting test method for the battery pack of the electric automobile.
Description
Technical Field
The invention belongs to the technical field of batteries of electric vehicles, and particularly relates to a bottom supporting test bench and a test method for a battery pack of an electric vehicle.
Background
In recent years, safety issues of electric vehicles, particularly safety issues of batteries, have been receiving increasing attention from professionals and consumers.
The battery pack is usually arranged under the chassis of the electric automobile, the bottom of the battery pack is not protected by the structure of the automobile body, and the area of the battery pack is large, so that the bottom of the battery pack is easily scratched and impacted in the running process of the electric automobile, and the running working condition is also called as an electric automobile bottom supporting working condition. When the bottom supporting working condition of the electric automobile occurs, the battery pack is extremely easy to damage, and the phenomenon of fire explosion can occur in serious cases, so that the safety performance of the battery pack is verified by simulating the bottom supporting working condition of the electric automobile through an experimental method, which is very necessary for design and development personnel of the battery pack.
In the prior art, the problems that the simulation of the working condition of the bottom supporting test is incomplete, the test flow is unreasonable, the automation degree is not high, the test process lacks effective treatment on the safety abnormal fault of the battery pack and the like exist.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a bottom supporting test bench and a test method for an electric vehicle battery pack, and aims to simulate the bottom supporting working condition of the electric vehicle and detect whether the performance of the battery pack under the working condition meets the design requirement.
In order to achieve the purpose, the invention adopts the technical scheme that: electric automobile battery package holds in palm end test bench, join in marriage the platform including the battery package that is used for installing the battery package, be used for controlling the battery package and go up and down and be used for making the battery package rise to the machine of lifting of target height, be used for receiving the battery package that is in target height and be used for holding in the palm end test bench that the battery package held in the palm the end experiment and be used for receiving come from holding in the palm end test bench and the battery package that appears abnormal conditions in the testing process carries out the safety pool of handling.
The battery pack assembling table comprises an assembling table base, a battery pack fixing plate, a battery pack fixing support and a plurality of first rollers, wherein the battery pack fixing plate is arranged on the assembling table base, the battery pack fixing support is arranged on the battery pack fixing plate and is used for installing a battery pack, the first rollers are arranged on the battery pack fixing plate, and the assembling table base is provided with a first sliding groove for embedding the first rollers.
The first sliding grooves are two, and the first rollers are arranged on the battery pack fixing plate in two rows.
The machine of lifting includes stand, elevating platform and sets up on the stand and the lifting actuator who is connected with the elevating platform, and the elevating platform has and lets the second spout of first gyro wheel embedding, the length direction of first spout and second spout parallel and first spout and second spout align.
The bottom supporting test bed comprises a test bed base, a test guide rail, a first support frame, a second support frame, a bottom supporting test tool table, a bottom supporting test block and a bottom hitting test ball, wherein the test guide rail, the first support frame and the second support frame are arranged on the test bed base, the bottom supporting test tool table is movably arranged on the test guide rail, the bottom cutting test block and the bottom hitting test ball are movably arranged on the bottom supporting test tool table along the vertical direction, the test bed base is located between the first support frame and the second support frame, the first support frame and the second support frame are provided with a third sliding groove, the first roller is embedded into the third sliding groove, the length direction of the first sliding groove is parallel to the length direction of the third sliding groove, the first sliding.
The test device is characterized in that a second roller is arranged on the test guide rail, the test bed base is provided with a fourth sliding groove in which the second roller is embedded, and the length direction of the fourth sliding groove is parallel to the length direction of the third sliding groove.
Set up first slide rail and the second slide rail that entries in the safety pool, first slide rail and the second slide rail that entries have and let the fifth spout of first gyro wheel embedding, the fifth spout on the first slide rail that entries with third spout on the first support frame intercommunication, the second slide rail that entries on the fifth spout with third spout on the second support frame intercommunication.
The invention also provides a bottom supporting test method for the battery pack of the electric automobile, which adopts the bottom supporting test bench for the battery pack of the electric automobile and comprises the following steps:
s1, mounting the battery pack on a battery pack assembly table;
s2, carrying out primary detection on the battery pack;
s3, fixedly transferring the battery pack to a lifting machine, lifting the battery pack to a target height by the lifting machine, and transferring the battery pack to a bottom supporting test bed;
s4, starting a battery pack bottom cutting test program, enabling a bottom supporting test tool table to carry a bottom cutting test block to linearly move along a first direction and a second direction, enabling the bottom cutting test block to find a bottom cutting test area on a battery pack, and then carrying out battery pack bottom cutting test; the first direction is parallel to the test guide rail, and the second direction is parallel to the length direction of the third sliding chute;
s5, after the bottom scraping test is finished, standing the battery pack for a first set time, and observing whether the battery pack has abnormal conditions; if so, go to step S9; if not, executing the next step;
s6, starting a battery pack bottom-collision testing program, enabling a bottom-supporting testing tool table to carry a bottom-collision testing ball to linearly move along a first direction, cutting a bottom testing block and moving along a vertical direction, enabling the bottom-collision testing ball to find a bottom-collision testing area on a battery pack, and then carrying out a battery pack bottom-collision test;
s7, after the bottom collision test is finished, the battery pack stands for a second set time, and whether the battery pack is abnormal or not is observed; if so, go to step S9; if not, executing the next step;
s8, transferring the battery pack to a battery pack assembly table, and detecting the battery pack again;
and S9, transferring the battery pack to a safety pool until the battery pack is immersed by water in the safety pool, and terminating the test.
The first set time is 30 minutes.
The second set time is 30 minutes.
The electric automobile battery pack bottom support test bench can simulate two working conditions of bottom cutting and bottom collision generated during bottom supporting of an electric automobile, is closer to the actual use condition of the electric automobile, and can detect whether the performance of a battery pack under the working conditions of bottom cutting and bottom collision meets the design requirement or not; the battery pack bottom supporting test belongs to a safety test, the phenomena of fire and explosion of the battery pack can possibly occur in the test process, the test bench can effectively treat the problems, and the test operation safety is ensured.
Drawings
The description includes the following figures, the contents shown are respectively:
FIG. 1 is a schematic structural diagram of a bottom supporting test bench for an electric vehicle battery pack according to the present invention;
FIG. 2 is a schematic view of a battery pack assembly station according to the present invention;
FIG. 3 is a schematic view of a battery pack lifter according to the present invention;
FIG. 4 is a schematic view of the structure of the base test stand and the safety pool of the present invention;
FIG. 5 is a schematic diagram of a bottom test procedure of the battery pack of the present invention;
FIG. 6 is a schematic diagram showing the moving direction of the bottom holding test tool table according to the present invention;
fig. 7 is a schematic view of a bottom region of a battery pack of the present invention;
FIG. 8 is a schematic diagram of a bottom impact area of a battery pack of the present invention;
labeled as: 1. a battery pack assembly table; 2. a lifter; 201. a column; 202. a lifting platform; 3. a bottom supporting test bed; 4. a safe water pool; 5. an assembly table base; 6. a battery pack fixing plate; 7. a battery pack fixing bracket; 8. a battery pack; 9. a test bed base; 10. a first support frame; 11. a second support frame; 12. testing the guide rail; 13. a bottom supporting test tool table; 14. scraping a bottom testing block; 15. hitting a bottom test ball; 16. a first water inlet slide rail; 17. a second water inlet slide rail; 18. a first bottom scraping region; 19. a second bottom cutting region; 20. a third bottom cutting region; 21. a first bottoming zone; 22. a second bottoming zone; 23. and a third run-on region.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to facilitate its implementation.
As shown in fig. 1 to 4, the present invention provides a battery pack holding test bed 3 rack for an electric vehicle, which includes a battery pack assembling table 1 for mounting a battery pack, a lifting machine 2 for controlling the battery pack to lift and for lifting the battery pack to a target height, a holding test bed 3 for receiving the battery pack at the target height and for performing a holding test on the battery pack, and a safety pool 4 for receiving the battery pack from the holding test bed 3 and handling the battery pack in an abnormal condition during the test.
Specifically, as shown in fig. 1 to 3, the battery pack assembling table 1 is used for mounting and fixing a battery pack to be tested, the battery pack assembling table 1 includes an assembling table base 5, a battery pack fixing plate 6 disposed on the assembling table base 5, a battery pack fixing bracket 7 disposed on the battery pack fixing plate 6 and used for mounting the battery pack, and a plurality of first rollers disposed on the battery pack fixing plate 6, and the assembling table base 5 has a first sliding groove into which the first rollers are inserted. Assembly table base 5 is the level setting, battery package fixed plate 6 is the level setting, the length direction and the first direction of battery package fixed plate 6 parallel, the width direction and the second direction of battery package fixed plate 6 parallel, first direction and second direction are horizontal direction and first direction and second direction mutually perpendicular, 7 fixed mounting of battery package fixed bolster are on the top surface of battery package fixed plate 6, battery package fixed bolster 7 sets up two, the battery package is installed on two battery package fixed bolsters 7, battery package fixed bolster 7 is used for simulating the installation fixed mode of battery package on electric automobile, two battery package fixed bolsters 7 are located the same straight line that parallels with the second direction. The first roller is a cylinder, the first roller is rotatably arranged on the battery pack fixing plate 6, and the axis of the first roller is parallel to the first direction. All first gyro wheels are two rows and arrange on battery package fixed plate 6, and two rows of first gyro wheels distribute in the relative both sides of battery package fixed plate 6, are located on the collinear with all first gyro wheels of one row and are in the collinear with the second direction parallel, and first spout sets up two, and the length direction and the second direction of first spout are parallel, can imbed one row of first gyro wheel respectively in each first spout. When battery package fixed plate 6 carried out rectilinear movement along the second direction, first gyro wheel can roll in first spout, and first spout plays the guide effect, and guide battery package fixed plate 6 can steadily move to the machine of lifting 2 on.
As shown in fig. 1, 3 and 4, the lifting machine 2 includes a column 201, a lifting platform 202 and a lifting actuator disposed on the column 201 and connected to the lifting platform 202, the lifting platform 202 has a second sliding slot into which the first roller is inserted, a length direction of the first sliding slot is parallel to a length direction of the second sliding slot, and the first sliding slot and the second sliding slot are aligned. The stand 201 is vertical setting, and stand 201 sets up two, and two stands 201 are in on the collinear with the first direction parallels, and elevating platform 202 is located between two stands 201, and elevating platform 202 is used for placing the battery package fixed plate 6 that carries the battery package. The second spout sets up two, and battery package fixed plate 6 can remove to between two second spouts, and in first gyro wheel embedding second spout simultaneously, first gyro wheel can roll in the second spout, and the second spout plays the guide effect, and guide battery package fixed plate 6 can steadily move. The lifting actuator is used for controlling the lifting platform 202 to move linearly in the vertical direction, and the lifting actuator has various forms, such as a hydraulic cylinder, an air cylinder or an electric cylinder. When the first chute and the second chute are in a communicated state, the battery pack fixing plate 6 on the assembly table base 5 can be moved onto the lifting table 202, and the battery pack fixing plate 6 on the lifting table 202 can also be moved onto the assembly table base 5.
As shown in fig. 1 and 4, the bottom-supporting test bed 3 includes a test bed base 9, a test guide rail 12 arranged on the test bed base 9, a first support frame 10 and a second support frame 11, a bottom-supporting test tool table 13 movably arranged on the test guide rail 12, a bottom-cutting test block 14 movably arranged on the bottom-supporting test tool table 13 along a vertical direction, and a bottom-impacting test ball 15, wherein the test bed base 9 is located between the first support frame 10 and the second support frame 11, the first support frame 10 and the second support frame 11 have a third sliding groove into which the first roller is embedded, a length direction of the first sliding groove is parallel to a length direction of the third sliding groove, the first sliding groove and the third sliding groove are aligned, and a length direction of the third sliding groove is perpendicular to a length direction of the test guide rail 12. The second roller is arranged on the test guide rail 12, the test bed base 9 is provided with a fourth sliding groove in which the second roller is embedded, and the length direction of the fourth sliding groove is parallel to the length direction of the third sliding groove. The first direction is parallel to the length direction of the test rail 12, and the second direction is parallel to the length direction of the third chute. The first support frame 10 and the second support frame 11 are vertically arranged on the test bed base 9, the first support frame 10 and the second support frame 11 are located on the same straight line parallel to the first direction, the lower ends of the first support frame 10 and the second support frame 11 are fixedly connected with the test bed base 9, the upper end of the first support frame 10 and the upper end of the second support frame 11 are both provided with a third sliding groove, and the lower end of the first support frame 10 and the lower end of the second support frame 11 are both provided with a fourth sliding groove. The test guide rails 12 are arranged in a plurality of numbers, all the test guide rails 12 are positioned on the same straight line parallel to the second direction, the test guide rails 12 play a role in guiding the bottom supporting test tool table 13, and the bottom supporting test tool table 13 is provided with guide holes for the test guide rails 12 to pass through.
As shown in fig. 1 and 4, the second roller is a cylinder, the second roller is rotatably disposed on the test rail 12, the second roller is embedded in the fourth sliding groove, and the number of the fourth sliding grooves is two. The two ends of the test guide rail 12 in the length direction are respectively provided with a second roller, the two second rollers on the test guide rail 12 are respectively embedded into two fourth sliding grooves, the second rollers can roll in the fourth sliding grooves, and the fourth sliding grooves play a role in guiding the test guide rail 12, so that the bottom supporting test tool table 13 can be guided to move linearly in the second direction.
As shown in fig. 1 and 4, in the present embodiment, two test rails 12 are provided.
As shown in fig. 1 and 4, after the battery pack carried by the lifting platform 202 rises to the target height, the second chutes and the third chutes are in a communicated state, each second chute and one third chute are respectively located on the same straight line parallel to the second direction, at this time, the battery pack fixing plate 6 can move to the first support frame 10 and the second support frame 11 from the lifting platform 202 with the battery pack, and the battery pack fixing plate 6 writes that the battery pack moves to the positions above the bottom scratch test block 14 and the bottom impact test ball 15, and waits for a test. The battery pack fixing plate 6 is provided with an avoidance hole for the penetration of the bottom scraping test block 14 and the bottom collision test ball 15, the avoidance hole is a through hole which is arranged at the center of the battery pack fixing plate 6 in a penetrating mode along the vertical direction, the avoidance hole is a rectangular hole, and the bottom scraping test block 14 and the bottom collision test ball 15 can penetrate through the avoidance hole and contact with a battery pack above the avoidance hole.
As shown in fig. 4, the bottom-impacting test ball 15 and the bottom-cutting test block 14 extend out towards the upper side of the bottom-supporting test tooling table 13, and a first actuator for controlling the bottom-cutting test block 14 to move along the vertical direction and a second actuator for controlling the bottom-impacting test ball 15 to move along the vertical direction are arranged inside the bottom-supporting test tooling table 13. The first actuator is connected with the cutting and backing test block 14, and the first actuator has various forms, such as a hydraulic cylinder, an air cylinder or an electric cylinder. The second actuator is connected with the bottom-hitting test ball 15, and the second actuator has various forms such as a hydraulic cylinder, an air cylinder or an electric cylinder. The test bed base 9 is provided with a third actuator for controlling the bottom supporting test tool table 13 to move along the second direction, the third actuator is connected with the bottom supporting test tool table 13, and the bottom supporting test tool table 13 has various forms, such as a hydraulic cylinder, an air cylinder or an electric cylinder.
As shown in fig. 1 and 4, a first water inlet slide rail 16 and a second water inlet slide rail 17 are arranged in the safety pool 4, the first water inlet slide rail 16 and the second water inlet slide rail 17 are provided with a fifth slide groove for embedding the first roller, the fifth slide groove on the first water inlet slide rail 16 is communicated with the third slide groove on the first support frame 10, and the fifth slide groove on the second water inlet slide rail 17 is communicated with the third slide groove on the second support frame 11. The first water inlet slide rail 16 and the second water inlet slide rail 17 are positioned on the same straight line parallel to the first direction, the first water inlet slide rail 16 and the second water inlet slide rail 17 are fixedly arranged in the safe water pool 4, the upper end of the first water inlet slide rail 16 is in butt joint with the first support frame 10, the upper end of the second water inlet slide rail 17 is in butt joint with the second support frame 11, the lower end of the first water inlet slide rail 16 and the lower end of the second water inlet slide rail 17 are positioned in the safe water pool 4, water is stored in the safe water pool 4, and after the first idler wheel on the battery pack fixing plate 6 is embedded into the fifth sliding groove, the battery pack can be guided by the first water inlet slide rail 16 and the second water inlet slide rail 17 to move downwards to the inside of the safe water pool 4, so that the battery pack with abnormal conditions can be immersed into the safe water pool 4 and immersed by the water in the safe water pool 4.
The invention also provides a battery pack bottom supporting test method for the electric automobile, which adopts the battery pack bottom supporting test bed 3 frame of the electric automobile with the structure and comprises the following steps:
s1, mounting the battery pack on the battery pack assembling table 1;
s2, carrying out primary detection on the battery pack;
s3, fixedly transferring the battery pack to the lifting machine 2, lifting the battery pack to a target height by the lifting machine 2, and transferring the battery pack to the bottom supporting test bed 3;
s4, starting a battery pack bottom cutting test program, enabling the bottom supporting test tool table 13 to carry out linear movement of the bottom cutting test block 14 along the first direction and the second direction, enabling the bottom cutting test block 14 to find a bottom cutting test area on a battery pack, and then carrying out a battery pack bottom cutting test; the first direction is parallel to the test guide rail 12, and the second direction is parallel to the length direction of the third sliding chute;
s5, after the bottom scraping test is finished, standing the battery pack for a first set time, and observing whether the battery pack has abnormal conditions; if so, go to step S9; if not, executing the next step;
s6, starting a battery pack bottom-collision testing program, enabling a bottom-supporting testing tool table 13 to carry out linear movement of a bottom-collision testing ball 15 along a first direction, cutting a bottom testing block 14 and moving along a vertical direction, enabling the bottom-collision testing ball 15 to find a bottom-collision testing area on a battery pack, and then carrying out battery pack bottom-collision testing;
s7, after the bottom collision test is finished, the battery pack stands for a second set time, and whether the battery pack is abnormal or not is observed; if so, go to step S9; if not, executing the next step;
s8, transferring the battery pack to the battery pack assembly table 1, and detecting the battery pack again;
and S9, transferring the battery pack into the safe water pool 4 until the battery pack is immersed by the water in the safe water pool 4, and terminating the test.
In the step S1, the battery pack fixing plate 6 is mounted on the assembly table base 5, the battery pack fixing bracket 7 is mounted on the battery pack fixing plate 6, and finally the battery pack to be tested is fixedly mounted on the battery pack fixing bracket 7 as required.
In the step S2, the battery pack mounted on the battery pack assembling table 1 is primarily detected, first, the insulation, temperature and voltage parameters of the battery pack are detected, and whether the parameters meet the requirements is judged, and it is ensured that the battery pack is free of faults, then, the bottom cutting test position and the ball impact test position of the battery pack to be tested are determined, and finally, according to the selected test position, the test program is debugged, so that the bottom cutting and bottom impact test area of the battery pack can be automatically found by the bottom supporting test tool table 13.
As shown in fig. 6, the bottom-supporting testing tool table 13 is mounted on the testing guide rail 12, the bottom-supporting testing tool table 13 can simulate the electric vehicle to move forward or backward along the testing guide rail 12, the bottom-supporting testing tool table 13 can carry the bottom-cutting testing block 14 and the bottom-hitting testing ball 15 to move along the first direction and the second direction, and a corresponding battery pack testing area can be found.
In the step S3, after the battery pack is lifted to the target height by the lifter 2, the two second sliding grooves on the lifting platform 202 are respectively in a communication state with the third sliding grooves on the first support frame 10 and the second support frame 11, each second sliding groove is respectively in a same straight line parallel to the second direction with one third sliding groove, then the battery pack fixing plate 6 can carry the battery pack to be transferred to the bottom supporting test bed 3, and the first roller rolls from the second sliding groove to the third sliding groove.
In the step S4, the battery pack bottom test program is started, and the test rail 12 moves in the test bed base 9 along the second direction, and the bottom supporting test tool table 13 moves on the test rail 12 along the first direction, so that the bottom supporting test block 14 on the bottom supporting test tool table 13 can find the battery pack bottom test area, and perform the battery pack bottom test.
As shown in fig. 7, the back cut test block 14 includes a wedge-shaped steel block with a bevel angle of 45 degrees, and the size is 75mm × 100 mm. A plurality of bottom scraping test areas on the battery pack are arranged, and the bottom scraping test areas are weak areas on the lower box body of the battery pack. In this embodiment, the bottoming test region on the battery pack includes a first bottoming region 18, the second bottom cutting area 19 and the third bottom cutting area 20 are also provided, namely three bottom cutting test areas on the battery pack are arranged, each bottom cutting test area is rectangular, the length of each bottom cutting test area is greater than the width, the length of each bottom cutting test area is 1000mm, the width of each bottom cutting test area is 100mm, the length direction of each bottom cutting test area is parallel to the first direction, the width direction of each bottom cutting test area is parallel to the second direction, each bottom cutting test area is distributed at different positions of the battery pack, all the bottom cutting test areas are positioned on the same straight line parallel to the second direction, the width of each bottom cutting test area is greater than the width of the wedge-shaped steel block, the second bottom cutting area 19 is positioned at the middle position of the battery pack, and the first bottom cutting area 18 and the third bottom cutting area 20 are distributed at two sides of the second bottom cutting area 19. After finding the bottom testing area at the corresponding position by the bottom testing block 14, the bottom testing block 14 is located below the bottom testing area, the bottom testing area is contacted with the bottom testing area, and then the bottom testing tooling table 13 carries the bottom testing block 14 to linearly move along the length direction of the bottom testing block 14 at a set speed for bottom testing, wherein the set speed is 10 Km/h. And the backing test tooling table 13 carries the bottom scraping test blocks 14 to sequentially move below each bottom scraping test area for bottom scraping test.
The wedge-shaped steel block with the inclined plane angle of 45 degrees and the size of 75mm multiplied by 100mm is used for simulating the working conditions of the electric automobile for cutting the bottom of the battery pack, such as deceleration strips, impact curbs, uphill tops, stones or bricks pressed on the road surface and the like. And selecting weak regions on the lower box body of the battery pack as bottom cutting test regions by simulating the structural design of the battery pack, wherein the weak regions respectively represent weak regions on the left side, the middle side and the right side of the battery pack, such as a first bottom cutting region 18, a second bottom cutting region 19 and a third bottom cutting region 20. The width of the test area is larger than that of the wedge-shaped steel block, so that the bottom scraping test can be carried out in the effective bottom scraping test area.
In the above step S5, the first set time is 30 minutes. The abnormal condition includes smoking or fire of the battery pack.
As shown in fig. 8, the bottom-hit test ball 15 is a rigid ball, and the radius of the bottom-hit test ball 15 is 75 mm. The battery pack is provided with a plurality of bottom-collision test areas, and the bottom-collision test areas are weak areas in the lower box body of the battery pack. In the present embodiment, the bottom impact test areas include a first bottom impact area 21, a second bottom impact area 22 and a third bottom impact area 23, that is, three bottom impact test areas are provided on the battery pack, each bottom impact test area is distributed at a different position of the battery pack, the bottom impact test areas are circular areas, and the radius of each bottom impact test area is 100 mm. The first and second run-down regions 21 and 22 are on the same straight line parallel to the first direction, and the second and third run-down regions 22 and 23 are on the same straight line parallel to the second direction.
After the bottom-collision test ball 15 finds the bottom-collision test area at the corresponding position, the bottom-collision test ball 15 is positioned below the bottom-collision test area, the bottom-collision test ball 15 moves upwards at a set speed, and collides with an upper battery pack to perform the bottom-collision test, wherein the set speed is 5 mm/s. And the bottom-supporting test tool table 13 carries the bottom-impacting test balls 15 to sequentially move to the lower part of each bottom-impacting test area for performing bottom-impacting test.
According to the battery pack bottom-collision test, a rigid ball with the radius of 75mm is selected according to the safety requirement of a power storage battery for an electric automobile (GB38031-2020), and is used for simulating the battery pack bottom-collision working condition when the bottom of the electric automobile is possibly seriously collided with a ground protrusion. And (3) scraping a bottom test area for the battery pack, selecting an area with a weak structure in a lower box body of the battery pack as a bottom collision test area through simulating the structural design of the battery pack, and setting a plurality of different areas, such as a first bottom collision area 21, a second bottom collision area 22 and a third bottom collision area 23, which respectively represent the weak areas in front of, in middle of and behind the battery pack. The radius of the test area should be larger than that of the rigid ball, so that the bottom impact test can be carried out in an effective bottom impact test area.
In the above step S7, the second set time is 30 minutes. The abnormal condition includes smoking or fire of the battery pack.
In step S8, the battery pack moved to the battery pack mounting table 1 is inspected again, the insulation, temperature, and voltage parameters of the battery pack are detected, and the test is completed after the detection results are recorded.
In the step S8, it is detected whether the content includes the insulation performance of each high-voltage interface of the battery pack meets the safety requirements; the detection content also comprises whether the temperature and voltage sampling of each battery core in the battery pack is abnormal or not, so that whether the functions of the battery pack are normal or not after the battery pack is subjected to a bottom cutting test and a bottom collision test is judged, and whether the design requirements are met or not is verified.
The electric vehicle battery pack bottom supporting test bench and the test method have the advantages that the test operation method is simple, the automation degree is high, and the test can be automatically completed under the control of a program after a tester completes battery pack assembly according to requirements; the simulation system can simulate two working conditions of bottom cutting and bottom collision during bottom supporting of the electric automobile, and is closer to the actual use condition of the electric automobile; according to the test method, the bottom cutting test is carried out firstly, and then the bottom collision test is carried out, so that the deformation of the shell of the battery pack caused by the bottom collision test can be effectively avoided, and the additional influence on the bottom cutting test can be avoided; the battery pack bottom supporting test belongs to a safety test, and the phenomena of fire and explosion of the battery pack can possibly occur in the test process.
The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.
Claims (10)
1. The electric vehicle battery pack bottom supporting test bed is characterized by comprising a battery pack assembling table for mounting a battery pack, a lifting machine for controlling the battery pack to lift and enabling the battery pack to ascend to a target height, a bottom supporting test bed for receiving the battery pack at the target height and carrying out a bottom supporting test on the battery pack, and a safety water pool for receiving the battery pack from the bottom supporting test bed and processing the battery pack with abnormal conditions in the test process.
2. The electric vehicle battery pack bottom supporting test bench according to claim 1, wherein the battery pack assembling bench comprises an assembling bench base, a battery pack fixing plate arranged on the assembling bench base, a battery pack fixing support arranged on the battery pack fixing plate and used for installing a battery pack, and a plurality of first rollers arranged on the battery pack fixing plate, and the assembling bench base is provided with a first sliding groove for the first rollers to be embedded in.
3. The electric vehicle battery pack bottom supporting test bed frame according to claim 2, wherein the number of the first sliding grooves is two, and the first rollers are arranged in two rows on the battery pack fixing plate.
4. The electric vehicle battery pack bottom supporting test bench according to claim 2 or 3, wherein the lifting machine comprises a stand column, a lifting table and a lifting execution mechanism arranged on the stand column and connected with the lifting table, the lifting table is provided with a second sliding groove in which the first roller is embedded, the length direction of the first sliding groove is parallel to the length direction of the second sliding groove, and the first sliding groove and the second sliding groove are aligned.
5. The electric vehicle battery pack bottom supporting test bed frame as claimed in claim 2 or 3, wherein the bottom supporting test bed comprises a test bed base, a test guide rail arranged on the test bed base, a first support frame and a second support frame, a bottom supporting test tool table movably arranged on the test guide rail, a bottom scraping test block and a bottom collision test ball movably arranged on the bottom supporting test tool table along a vertical direction, the test bed base is located between the first support frame and the second support frame, the first support frame and the second support frame are provided with a third sliding groove for embedding the first idler wheel, the length direction of the first sliding groove is parallel to the length direction of the third sliding groove, the first sliding groove and the third sliding groove are aligned, and the length direction of the third sliding groove is perpendicular to the length direction of the test guide rail.
6. The electric vehicle battery pack bottom-supporting test bed according to claim 5, wherein the test rail is provided with a second roller, the test bed base is provided with a fourth sliding groove for the second roller to be embedded in, and the length direction of the fourth sliding groove is parallel to the length direction of the third sliding groove.
7. The electric vehicle battery pack bottom supporting test bed according to claim 5, wherein a first water inlet slide rail and a second water inlet slide rail are arranged in the safety water pool, the first water inlet slide rail and the second water inlet slide rail are provided with fifth slide grooves for the first idler wheels to be embedded in, the fifth slide grooves on the first water inlet slide rail are communicated with the third slide grooves on the first supporting frame, and the fifth slide grooves on the second water inlet slide rail are communicated with the third slide grooves on the second supporting frame.
8. The electric vehicle battery pack bottom supporting test method is characterized in that the electric vehicle battery pack bottom supporting test bench of any one of claims 1 to 7 is adopted, and the method comprises the following steps:
s1, mounting the battery pack on a battery pack assembly table;
s2, carrying out primary detection on the battery pack;
s3, fixedly transferring the battery pack to a lifting machine, lifting the battery pack to a target height by the lifting machine, and transferring the battery pack to a bottom supporting test bed;
s4, starting a battery pack bottom cutting test program, enabling a bottom supporting test tool table to carry a bottom cutting test block to linearly move along a first direction and a second direction, enabling the bottom cutting test block to find a bottom cutting test area on a battery pack, and then carrying out battery pack bottom cutting test; the first direction is parallel to the test guide rail, and the second direction is parallel to the length direction of the third sliding chute;
s5, after the bottom scraping test is finished, standing the battery pack for a first set time, and observing whether the battery pack has abnormal conditions; if so, go to step S9; if not, executing the next step;
s6, starting a battery pack bottom-collision testing program, enabling a bottom-supporting testing tool table to carry a bottom-collision testing ball to linearly move along a first direction, cutting a bottom testing block and moving along a vertical direction, enabling the bottom-collision testing ball to find a bottom-collision testing area on a battery pack, and then carrying out a battery pack bottom-collision test;
s7, after the bottom collision test is finished, the battery pack stands for a second set time, and whether the battery pack is abnormal or not is observed; if so, go to step S9; if not, executing the next step;
s8, transferring the battery pack to a battery pack assembly table, and detecting the battery pack again;
and S9, transferring the battery pack to a safety pool until the battery pack is immersed by water in the safety pool, and terminating the test.
9. The electric vehicle battery pack tray test method of claim 8, wherein the first set time is 30 minutes.
10. The electric vehicle battery pack bottom test method according to claim 8 or 9, wherein the second set time is 30 minutes.
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