Safety performance detection device and method for new energy automobile battery

Abstract

The invention discloses a safety performance detection device and method for a new energy automobile battery, and the device comprises a conveying device for conveying a battery pack, a water tank for containing saline water, and a data analysis and processing module for processing the water seepage detection data of the battery pack. A water retaining structure for measuring the water seepage performance of the battery pack is arranged on the water containing tank, a lifting component for driving the bearing plate to freely move in the vertical direction is arranged on the water containing tank, two groups of power-on copper sheets are symmetrically arranged on the two horizontal sides of the bearing plate, and the two groups of power-on copper sheets are fixedly connected to the water containing tank. The electrical safety performance of the battery in a water immersion state can be accurately reflected through the change of a circuit resistance value when the battery pack is immersed in saline water, the device is automatically reset to ensure that the next detection can be carried out under the same condition, and the repeatable detection method is beneficial to efficiently and continuously detecting a large batch of batteries, so that the detection efficiency is improved. Without frequently plugging lines, the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery performance detection, and in particular to a safety performance detection device and method for a new energy vehicle battery. Background Art

[0002] In the rapid development of new energy vehicles, power batteries, as one of their core components, play a vital role in the performance and safety of the entire vehicle. However, since the battery may be affected by external impact, overcharge, over-discharge, battery short circuit, high temperature and other factors during use, it is very easy to cause thermal runaway, leakage, fire and even explosion and other safety problems. Therefore, comprehensive testing of the safety performance of new energy vehicle batteries has become an important part of ensuring the safe and reliable operation of electric vehicles.

[0003] Chinese patent (Announcement No.: CN117184887A), this solution specifically includes a battery and a clamping and protecting assembly installed on the outside of the battery, a detection box device is provided in front of the clamping and protecting assembly, and a battery pushing assembly is provided behind the clamping and protecting assembly; the clamping and protecting assembly includes two symmetrically set U-shaped clamps and a first pushing mechanism located above the U-shaped clamps; the first pushing mechanism includes a fixed plate and a first connecting strip fixedly installed on the top surface of the fixed plate. The present invention provides a new energy battery detection device, which can wrap and clamp the battery through the setting of the U-shaped clamp to prevent the battery from falling during the transfer process; through the setting of the fastening partition, it is used for fixed clamping when testing the battery, which is more stable and reliable; through the setting of the present invention, a detection device is set above the conveyor belt, and after the detection is completed, the battery can be sent back to the conveyor belt, saving time and effort.

[0004] The battery detection device in the above patent is mainly suitable for monitoring battery parameters such as voltage, current and temperature. However, new energy vehicles may encounter complex environmental conditions during use, such as driving in rainy days, wading sections and car washing, and even extreme conditions such as vehicle wading or immersion in water. Under these conditions, the sealing and protective performance of the battery are particularly critical to the safety of the entire vehicle. However, the existing detection technology is difficult to efficiently perform continuous detection on large quantities of batteries when conducting wading experiments on battery packs. In addition, during the detection process, when evaluating wading safety by monitoring parameters such as battery voltage, it is necessary to frequently plug and unplug the lines, and after the detection is completed, it may be inconvenient for the subsequent handling process. The operation is cumbersome and affects continuity, resulting in difficulty in improving the detection efficiency. Therefore, a safety performance detection device and method for new energy vehicle batteries are proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a safety performance detection device and method for new energy vehicle batteries, which has the advantage of being able to accurately reflect the electrical safety performance of the battery when immersed in water, and solves the problem of low efficiency of the existing water-related detection process.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a safety performance testing device for new energy vehicle batteries, comprising a conveying device for conveying battery packs, and a water storage tank for containing salt water, and also comprising a data analysis and processing module for processing battery pack water seepage detection data, wherein the water storage tank is provided with a water-repelling structure for measuring the water seepage performance of the battery pack; The water-repelling structure includes a supporting plate arranged on the water tank and used to support the battery pack. The water tank is provided with a lifting assembly that drives the supporting plate to move freely in the vertical direction. Two sets of electrical copper plates are symmetrically arranged on both horizontal sides of the supporting plate. Both sets of electrical copper plates are fixedly connected to the water tank. A bottom positioning frame is fixedly connected to the bottom wall of the water tank, an electromagnetic coil is fixedly connected to the bottom positioning frame, and the electromagnetic coil is electrically connected to two sets of copper sheets for electrical connection, a series circuit with a smooth circuit is formed between the electromagnetic coil and the copper sheets for electrical connection, and a magnetic block is provided on the bottom positioning frame corresponding to the position of the electromagnetic coil; A pressure sensor is fixedly connected to the bottom positioning frame, and the pressure sensor is electrically connected to the data analysis and processing module. A guide block that can move freely in the horizontal direction is provided between the electromagnetic coil and the bottom positioning frame, and a warning component is provided on the bottom positioning frame, which prompts the guide block to contact the pressure sensor according to the magnetic change at the electromagnetic coil.

[0007] Preferably, the warning component includes a median horizontal sliding seat arranged on the bottom positioning frame, and a horizontal sliding groove is provided on the bottom positioning frame for the median horizontal sliding seat to slide and connect in the horizontal direction, the median horizontal sliding seat and the magnetic block are fixedly connected, and a rectangular groove is provided on the median horizontal sliding seat for the guide block to slide and connect in the horizontal direction; The middle horizontal sliding seat is provided with a limiting component for limiting the movement of the guide block.

[0008] Preferably, a trapezoidal block is fixedly connected to the middle horizontal sliding seat, a guide column is fixedly connected to one end of the guide block facing the trapezoidal block, and a circular hole is provided on the trapezoidal block for the guide column to slide through; The outer ring of the guide column is provided with a return spring, and the two ends of the return spring are respectively fixedly connected to the trapezoidal block and the guide block.

[0009] Preferably, the limit assembly comprises a side support plate fixedly connected to the bottom positioning frame, a fixed swing rod is arranged on the side support plate for fixed axis rotation, a sharp angle block is fixedly connected to a side of the guide block facing the fixed swing rod, and a triangular block is arranged on the fixed swing rod for contact connection with the sharp angle block; The trapezoidal block comprises an integrally formed top inclined surface, and the fixed swing rod is provided with an end inclined portion which is in sliding contact with the top inclined surface.

[0010] Preferably, the lifting assembly includes a plurality of worm gears that can rotate freely in the vertical direction, each of the plurality of worm gears is provided with a U-shaped isotropic frame, and the U-shaped isotropic frame and the worm gear are fixedly connected; The U-shaped co-positioning frame is fixedly connected with an L-shaped turning rod, a connecting rod is fixedly rotated on the L-shaped turning rod, and one end of the connecting rod away from the L-shaped turning rod is fixedly rotated on the supporting plate.

[0011] Preferably, a worm is fixedly rotated on the water tank, multiple groups of worm wheels are distributed in a ring shape with the worm as the center line, and the worm and the worm wheel are meshingly connected. A positioning seat is fixedly connected to the water tank, and the worm wheel rotates on the fixed axis on the positioning seat.

[0012] Preferably, the worm is coaxially fixed with a driven bevel gear, the driven bevel gear is meshingly connected with a driving bevel gear, and the driving bevel gear and the fixed pendulum arm are coaxially fixed.

[0013] Preferably, when the battery pack is at the lowest point in the vertical stroke, the electrical copper sheet is completely submerged in the salt water level line.

[0014] Preferably, a safety performance testing method for a new energy vehicle battery is applied to a safety performance testing device for a new energy vehicle battery, comprising the following steps: S1. Preparation: Place the battery pack on the conveying equipment, ensure that the equipment is in the starting state, add an appropriate amount of salt water into the water tank, and make the salt water level below the level of the copper sheet for connection; S2, drop test: The battery pack falls freely onto the support plate to simulate the physical impact that may occur during actual use, transportation or accidental drop; S3, water immersion detection: As the battery pack gradually sinks into the salt water, the salt water level gradually rises, the salt water begins to contact the copper sheet, and the contact area gradually increases. The resistance value of the circuit where the copper sheet is located gradually decreases. The safety performance of the battery pack is judged by detecting the presence or absence of pressure signals; S4, lifting and moving: After the detection is completed, the horizontal height of the support plate can be automatically raised to lift the battery pack out of the salt water and rise to the set transfer position; S5. Component reset: After a single test is completed, the horizontal height of the support plate drops to the initial position, and the components used for water immersion testing automatically return to the initial position to prepare for the next test.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention sets a water-repelling structure, and the change of the circuit resistance value when the battery pack is immersed in salt water can accurately reflect the electrical safety performance of the battery in the water-immersed state, thereby effectively detecting the sealing performance of the battery pack, and the device automatically resets and returns to the initial state to ensure that the next detection can be carried out under the same conditions. This repeatable detection method helps to efficiently and continuously detect large quantities of batteries without frequently plugging and unplugging the lines, so as to improve the detection efficiency.

[0016] The present invention sets up a water-repelling structure to simulate the use of the battery pack in two extreme scenarios, namely, falling and immersion, and comprehensively evaluates the physical impact resistance and electrical safety of the battery pack. This comprehensive detection method can identify potential safety hazards that may occur in the actual use of the battery pack, providing strong support for product improvement and quality control. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a detection method flow of a safety performance detection device for a new energy vehicle battery of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the components where the bottom positioning frame of the present invention is located; Figure 4 This is a schematic diagram of the components where the supporting plate of the present invention is located; Figure 5 It is a schematic diagram of the components where the electromagnetic coil of the present invention is located; Figure 6 For the present invention Figure 4 Enlarged view of point A in the middle; Figure 7 It is a schematic diagram of the components where the middle horizontal sliding seat of the present invention is located; Figure 8 This is a schematic diagram of the components of the U-shaped co-location frame of the present invention; Fig. 9 For the present invention Figure 7 Enlarged view of point B in the middle; Fig.10 Schematic diagram of the battery pack water immersion detection process of the present invention.

[0018] In the figure: 1. water tank; 2. conveying equipment; 3. supporting plate; 4. bottom positioning frame; 5. electromagnetic coil; 6. magnetic block; 7. middle horizontal sliding seat; 8. guide block; 9. trapezoidal block; 10. guide column; 11. reset spring; 12. fixed swing rod; 13. end oblique part; 14. sharp angle block; 15. triangular block; 16. side support plate; 17. active bevel gear; 18. driven bevel gear; 19. pressure sensor; 20. worm; 21. worm wheel; 22. U-shaped isotropic frame; 23. positioning seat; 24. L-shaped turning rod; 25. connecting rod; 26. battery pack; 27. top inclined surface; 28. copper sheet for connecting electricity. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figures 1 to 10 The present invention provides a technical solution: a safety performance testing device for a new energy vehicle battery, comprising a conveying device 2 for conveying a battery pack 26, and a water tank 1 for containing salt water, and also comprising a data analysis and processing module for processing water seepage detection data of the battery pack 26, wherein the water tank 1 is provided with a water-repelling structure for measuring the water seepage performance of the battery pack 26; The water-repelling structure includes a support plate 3 disposed on the water tank 1 and used to support the battery pack 26. The water tank 1 is provided with a lifting assembly that drives the support plate 3 to move freely in the vertical direction. Two groups of electrical copper plates 28 are symmetrically disposed on both horizontal sides of the support plate 3. The two groups of electrical copper plates 28 are fixedly connected to the water tank 1. A bottom positioning frame 4 is fixedly connected to the bottom wall of the water tank 1, and an electromagnetic coil 5 is fixedly connected to the bottom positioning frame 4. The electromagnetic coil 5 is electrically connected to two sets of electrical copper sheets 28, and a series circuit with a smooth circuit is formed between the electromagnetic coil 5 and the electrical copper sheets 28. A magnetic block 6 is provided at a position of the bottom positioning frame 4 corresponding to the electromagnetic coil 5. A pressure sensor 19 is fixedly connected to the bottom positioning frame 4, and the pressure sensor 19 is electrically connected to the data analysis and processing module. A guide block 8 that can move freely in the horizontal direction is provided between the electromagnetic coil 5 and the bottom positioning frame 4, and a warning component is provided on the bottom positioning frame 4, which prompts the guide block 8 to contact the pressure sensor 19 according to the magnetic change at the electromagnetic coil 5.

[0021] like Figure 2 , Figure 3 , Figure 4 and Fig.10As shown, when the battery pack 26 is tested for water seepage to detect the sealing performance and thermal runaway protection capability of the power copper sheet 28, the battery pack 26 is transported to the top of the support plate 3 by the conveying device 2, and the battery pack 26 falls from the end of the conveying device 2 onto the support plate 3, thereby simulating the physical impact that the battery pack 26 may be subjected to during actual use, transportation or accidental dropping, and helping to verify the impact resistance of the battery pack 26. By performing a drop test, it is possible to evaluate whether the outer shell and internal structure of the battery pack 26 can remain intact when subjected to external forces, and whether it will rupture, deform or be otherwise damaged after being impacted. The leakage-proof performance of the battery pack 26 after falling can also be evaluated to detect whether the electrolyte leaks due to damage to the outer shell or failure of the seal, thereby avoiding corrosion of the internal components of the battery pack 26 or the occurrence of safety accidents.

[0022] At the same time, the water tank 1 contains a certain amount of salt water. When the battery pack 26 slides from the conveying equipment 2 to the supporting plate 3, the battery pack 26 gradually sinks into the salt water, and as the battery pack 26 gradually sinks into the salt water, the water level of the salt water will gradually rise. When the battery pack 26 does not contact the salt water, the water level of the salt water is lower than the horizontal height of the power-connecting copper sheet 28. At this time, the line where the power-connecting copper sheet 28 is located is blocked. However, as the battery pack 26 gradually sinks into the salt water, the power-connecting copper sheet 28 gradually contacts the salt water, and as the water level rises, the contact area between the power-connecting copper sheet 28 and the salt water gradually increases.

[0023] In this process, in the initial state, the lines where the copper sheet 28 and the electromagnetic coil 5 are located are not smooth, so no magnetism is generated at the electromagnetic coil 5, and thus the magnetic block 6 is not driven to move horizontally. As the battery pack 26 is gradually immersed in the salt water, the contact area between the copper sheet 28 and the salt water gradually increases, and tends to be stable after the salt water is completely immersed in the battery pack 26. In this process, when the salt water contacts the copper sheet 28, the salt water, as a conductive medium, begins to form a conductive path for the current. Since the circuit begins to conduct, the resistance is large, so the current is relatively small. As the water level of the salt water gradually rises, the area of ​​the copper sheet 28 immersed in the salt water increases, the conductive path gradually widens, and the resistance further decreases. Therefore, the current gradually increases, thereby enhancing the magnetic field on the electromagnetic coil 5. When the salt water completely immerses the copper sheet 28 and covers a certain height, the resistance of the circuit tends to be stable, and the current reaches a stable maximum value. At this time, the magnetic field at the electromagnetic coil 5 remains unchanged.

[0024] At the same time, when the salt water completely immerses the copper sheet 28 and drives the magnetic field of the electromagnetic coil 5 to be at the maximum value of the set range, the magnetic field at the electromagnetic coil 5 attracts the magnetic block 6 to move horizontally and drives the lifting assembly to operate, thereby increasing the horizontal height of the battery pack 26, so that the battery pack 26 can move upward, thereby lowering the salt water level line, so that the battery pack 26 on the support plate 3 is above the salt water level line, and the battery pack 26 is removed from the support plate 3 by an external handling equipment to complete a single detection process.

[0025] Among them, if the electrolyte leaks in the battery pack 26 during the falling process, the leaked liquid may enter the salt water and change the conductivity of the salt water, thereby affecting the resistance value of the circuit where the copper sheet 28 is located, and the current curve may fluctuate abnormally. When the current value of the circuit where the copper sheet 28 is located exceeds the set value due to the leakage of the electrolyte, the magnetic force at the electromagnetic coil 5 is further enhanced, and the horizontal displacement of the magnetic block 6 attracted by the electromagnetic coil 5 increases, so as to drive the guide block 8 to be able to squeeze and contact with the pressure sensor 19. At this time, the pressure sensor 19 transmits the pressure signal to the signal receiving and processing module. When the signal receiving and processing module receives the pressure signal, it indicates that the battery may fail and its safety performance needs to be further verified.

[0026] In one of the more preferred embodiments, the warning component includes a median horizontal slide seat 7 arranged on the bottom positioning frame 4, and a horizontal slide groove is provided on the bottom positioning frame 4 for the median horizontal slide seat 7 to slide and connect in the horizontal direction, the median horizontal slide seat 7 and the magnetic block 6 are fixedly connected, and a rectangular groove is provided on the median horizontal slide seat 7 for the guide block 8 to slide and connect horizontally; The middle horizontal sliding seat 7 is provided with a limiting component for limiting the movement of the guide block 8.

[0027] The middle horizontal sliding seat 7 is fixedly connected with a trapezoidal block 9, and one end of the guide block 8 facing the trapezoidal block 9 is fixedly connected with a guide column 10, and the trapezoidal block 9 is provided with a circular hole for the guide column 10 to slide through; The outer ring of the guide column 10 is provided with a return spring 11, and the two ends of the return spring 11 are fixedly connected to the trapezoidal block 9 and the guide block 8 respectively.

[0028] like Figure 4 , Figure 7 and Fig. 9 As shown, when the battery pack 26 is gradually immersed in the salt water, the water level of the salt water gradually rises. At this time, the contact area between the power copper sheet 28 and the salt water gradually increases, and the resistance value of the circuit where the electromagnetic coil 5 and the power copper sheet 28 are located gradually decreases, thereby increasing the current value of the circuit where they are located, so as to drive the magnetism at the electromagnetic coil 5 to gradually increase, and drive the magnetic block 6 and the middle horizontal sliding seat 7 fixedly connected thereto to gradually increase the displacement in the horizontal direction.

[0029] Among them, when the middle horizontal slide seat 7 moves away from the electromagnetic coil 5, the guide block 8 cannot move horizontally synchronously with the middle horizontal slide seat 7 due to the restriction of the limit assembly. Therefore, the distance between the guide block 8 and the trapezoidal block 9 fixed on the middle horizontal slide seat 7 changes, thereby driving the guide column 10 to slide through the trapezoidal block 9 and driving the return spring 11 to undergo compression deformation.

[0030] Furthermore, the limit assembly includes a side support plate 16 fixedly connected to the bottom positioning frame 4, a fixed swing rod 12 is fixedly rotated on the side support plate 16, a sharp angle block 14 is fixedly connected to one side of the guide block 8 facing the fixed swing rod 12, and a triangular block 15 is provided on the fixed swing rod 12 to be in contact with the sharp angle block 14; The trapezoidal block 9 includes an integrally formed top inclined surface 27 , and the fixed swing rod 12 is provided with an end inclined portion 13 that is in sliding contact with the top inclined surface 27 .

[0031] like Figure 7 and Fig. 9 As shown, in the initial state, the triangular block 15 is in contact with the sharp-angled block 14. Therefore, when the median horizontal slide 7 initially moves, the horizontal movement of the guide block 8 is limited by the obstruction of the triangular block 15. As the magnetic block 6 and the median horizontal slide 7 further move in the horizontal direction, the end inclined portion 13 arranged at the end of the fixed pendulum rod 12 corresponds to the position of the top inclined surface 27 to drive the sliding contact between the end inclined portion 13 and the top inclined surface 27. During this process, the fixed pendulum rod 12 can swing in the vertical direction to change the position of the triangular block 15 so that the triangular block 15 no longer contacts the sharp-angled block 14.

[0032] At the same time, the reset spring 11 restores its elastic deformation, thereby driving the guide block 8 to move rapidly in the horizontal direction, thereby completing the unlocking of the guide block 8, so that the guide block 8 can subsequently move horizontally synchronously with the mid-position horizontal slide seat 7. When the battery pack 26 is in a normal state, the displacement of the magnetic block 6 in the horizontal direction will not drive the guide block 8 to contact the pressure sensor 19. Only when the line where the electromagnetic coil 5 is located is abnormal and causes its line current value to increase, the magnetic block 6 can further move in the horizontal direction to drive the guide block 8 to press against the contact pressure sensor 19, thereby judging whether the battery pack 26 is faulty by the presence or absence of a pressure signal.

[0033] It should be noted that a torsion spring is provided on the side support plate 16 to drive the fixed pendulum rod 12 to return to its initial position. The torsion spring is an existing device and a technical means well known to those skilled in the art, so it is not shown in the figure. Therefore, when the fixed pendulum rod 12 is deflected to the initial position, and then when the battery pack 26 is continuously inspected, it can be automatically reset to limit the position of the sharp-angle block 14 and the guide block 8 again.

[0034] Based on the warning component embodiment, the lifting component includes multiple groups of worm gears 21 that can rotate freely in the vertical direction, and each of the multiple groups of worm gears 21 is provided with a U-shaped isotropic frame 22, and the U-shaped isotropic frame 22 and the worm gear 21 are fixedly connected; The U-shaped isotropic frame 22 is fixedly connected with an L-shaped turning rod 24 , on which a connecting rod 25 is fixedly rotated, and one end of the connecting rod 25 away from the L-shaped turning rod 24 is fixedly rotated on the supporting plate 3 .

[0035] A worm 20 is fixedly rotated on the water tank 1, and multiple groups of worm wheels 21 are distributed in a ring shape with the worm 20 as the center line, and the worm 20 and the worm wheel 21 are meshed and connected. A positioning seat 23 is fixedly connected to the water tank 1, and the worm wheel 21 is fixedly rotated on the positioning seat 23.

[0036] The worm 20 is coaxially fixed with a driven bevel gear 18 , and the driven bevel gear 18 is meshingly connected with a driving bevel gear 17 . The driving bevel gear 17 and the fixed pendulum rod 12 are coaxially fixed.

[0037] like Figure 4 , Figure 6 and Figure 8 As shown, when the top inclined surface 27 is in contact with the end inclined portion 13 and drives the fixed pendulum rod 12 to deflect, it can drive the active bevel gear 17 coaxially fixed with the fixed pendulum rod 12 to rotate synchronously. During the rotation process, the active bevel gear 17 can drive the driven bevel gear 18 meshing with it and the worm 20 coaxially fixed with the driven bevel gear 18 to rotate synchronously.

[0038] At the same time, when the worm 20 rotates horizontally, it can drive the multiple groups of worm wheels 21 meshing therewith to rotate freely in the vertical direction. A U-shaped isotropic frame 22 is fixedly arranged on the worm wheel 21, and the U-shaped isotropic frame 22 is fixedly connected to the L-shaped turning rod 24. Therefore, the horizontal height of the L-shaped turning rod 24 can be changed by the rotation of the worm wheel 21. At the same time, the L-shaped turning rod 24 can drive the connecting rod 25 to swing when it swings, thereby driving the supporting plate 3 set at the end of the connecting rod 25 to move in the vertical direction, so as to raise the horizontal height of the supporting plate 3 and the battery pack 26 thereon, so as to facilitate the handling equipment to remove the battery pack 26 from the supporting plate 3, and when the battery pack 26 moves upward, the water level of the salt water in the water tank 1 is lowered, thereby gradually reducing the current value of the circuit where the electromagnetic coil 5 is located, and driving the mid-position horizontal sliding seat 7 to move in the horizontal direction, thereby resetting the fixed pendulum rod 12 under the action of the torsion spring, and restoring the horizontal height of the supporting plate 3 to the initial height.

[0039] A safety performance testing method for a new energy vehicle battery comprises the following steps: S1. Preparation: Place the battery pack 26 on the conveying device 2, ensure that the device is in the starting state, add an appropriate amount of salt water into the water tank 1, and make the salt water level below the level of the power copper sheet 28; S2, drop detection: the battery pack 26 falls freely onto the support plate 3, simulating the physical impact that may occur during actual use, transportation or accidental drop; S3, water immersion detection: As the battery pack 26 gradually sinks into the salt water, the salt water level gradually rises, the salt water begins to contact the power copper sheet 28, and the contact area gradually increases, and the resistance value of the circuit where the power copper sheet 28 is located gradually decreases. The safety performance of the battery pack 26 is judged by detecting the presence or absence of a pressure signal; S4, lifting and moving: after the detection is completed, the horizontal height of the supporting plate 3 can be automatically raised to lift the battery pack 26 out of the salt water and rise to the set transfer position; S5. Component reset: After a single test is completed, the horizontal height of the support plate 3 drops to the initial position, and the components used for water immersion detection automatically return to the initial position to prepare for the next test.

[0040] First, in the preparation stage, the battery pack 26 to be tested is placed on the conveying device 2, and the device is ensured to be in the startup state. At the same time, an appropriate amount of salt water is added to the water tank 1, and the salt water level is controlled to be lower than the level of the power copper sheet 28, so as to carry out the subsequent water immersion test. Then, the battery pack 26 is released freely and falls onto the supporting plate 3 to simulate the possible falling impact, so as to observe the structural integrity and impact resistance of the battery pack 26. Subsequently, as the battery pack 26 gradually sinks into the salt water, the salt water level gradually rises and contacts the power copper sheet 28, which will change the resistance value of the circuit. By detecting the presence or absence of the pressure signal, it is evaluated whether the battery pack 26 will have electrical safety performance problems when it is immersed in water.

[0041] After the detection is completed, the device can automatically adjust the height of the support plate 3 to separate the battery pack 26 from the salt water and move it to the set position for subsequent processing. Finally, all components of the equipment will be reset to the initial state to prepare for the next detection. This detection method simulates the actual usage scenario, comprehensively evaluates the safety performance of the battery pack 26, and effectively ensures the safety and reliability of the battery in actual applications.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety performance testing device for a new energy vehicle battery, comprising a conveying device (2) for conveying a battery pack (26), and a water tank (1) for containing salt water, and also comprising a data analysis and processing module for processing water seepage detection data of the battery pack (26), characterized in that: The water storage tank (1) is provided with a water-repelling structure for measuring the water permeability of the battery pack (26); The water-repelling structure comprises a support plate (3) arranged on the water tank (1) and used to support the battery pack (26); a lifting assembly is provided on the water tank (1) to drive the support plate (3) to move freely in the vertical direction; two groups of electrical copper plates (28) are symmetrically arranged on both horizontal sides of the support plate (3); the two groups of electrical copper plates (28) are fixedly connected to the water tank (1); A bottom positioning frame (4) is fixedly connected to the bottom wall of the water tank (1), an electromagnetic coil (5) is fixedly connected to the bottom positioning frame (4), and the electromagnetic coil (5) is electrically connected to two sets of electrical copper sheets (28), a series circuit with a smooth circuit is formed between the electromagnetic coil (5) and the electrical copper sheets (28), and a magnetic block (6) is provided at a position of the bottom positioning frame (4) corresponding to the electromagnetic coil (5); A pressure sensor (19) is fixedly connected to the bottom positioning frame (4), and the pressure sensor (19) is electrically connected to the data analysis and processing module. A guide block (8) that can move freely in the horizontal direction is provided between the electromagnetic coil (5) and the bottom positioning frame (4), and a warning component is provided on the bottom positioning frame (4) that causes the guide block (8) to contact the pressure sensor (19) according to the magnetic change at the electromagnetic coil (5).

2. A safety performance testing device for new energy vehicle batteries according to claim 1, characterized in that: The warning component comprises a middle horizontal sliding seat (7) arranged on a bottom positioning frame (4), and a horizontal sliding groove is provided on the bottom positioning frame (4) for the middle horizontal sliding seat (7) to be connected by sliding in a horizontal direction, the middle horizontal sliding seat (7) and the magnetic block (6) are fixedly connected, and a rectangular groove is provided on the middle horizontal sliding seat (7) for the guide block (8) to be connected by horizontal sliding; The middle horizontal sliding seat (7) is provided with a limiting component for limiting the movement of the guide block (8).

3. A safety performance testing device for new energy vehicle batteries according to claim 2, characterized in that: The middle horizontal sliding seat (7) is fixedly connected to a trapezoidal block (9), one end of the guide block (8) facing the trapezoidal block (9) is fixedly connected to a guide column (10), and the trapezoidal block (9) is provided with a circular hole for the guide column (10) to slide through; The outer ring of the guide column (10) is provided with a return spring (11), and the two ends of the return spring (11) are respectively fixedly connected to the trapezoidal block (9) and the guide block (8).

4. A safety performance testing device for new energy vehicle batteries according to claim 3, characterized in that: The limit assembly comprises a side support plate (16) fixedly connected to the bottom positioning frame (4), a fixed swing rod (12) is provided on the side support plate (16) for fixed axis rotation, a sharp angle block (14) is fixedly connected to a side of the guide block (8) facing the fixed swing rod (12), and a triangular block (15) is provided on the fixed swing rod (12) for contact connection with the sharp angle block (14); The trapezoidal block (9) comprises an integrally formed top inclined surface (27), and the fixed swing rod (12) is provided with an end inclined portion (13) which is in sliding contact with the top inclined surface (27).

5. A safety performance testing device for new energy vehicle batteries according to claim 4, characterized in that: The lifting assembly comprises a plurality of groups of worm gears (21) that are freely rotatable in the vertical direction, each of the plurality of groups of worm gears (21) is provided with a U-shaped isotropic frame (22), and the U-shaped isotropic frame (22) and the worm gear (21) are fixedly connected; An L-shaped turning rod (24) is fixedly connected to the U-shaped isotropic frame (22), a connecting rod (25) is fixedly rotatable on the L-shaped turning rod (24), and one end of the connecting rod (25) away from the L-shaped turning rod (24) is fixedly rotatable on the supporting plate (3).

6. A safety performance testing device for new energy vehicle batteries according to claim 5, characterized in that: A worm (20) is fixedly rotatable on the water tank (1), a plurality of worm gears (21) are distributed in a ring shape with the worm (20) as the center line, and the worm (20) and the worm gear (21) are meshingly connected. A positioning seat (23) is fixedly connected to the water tank (1), and the worm gear (21) is fixedly rotatable on the positioning seat (23).

7. A safety performance testing device for new energy vehicle batteries according to claim 6, characterized in that: The worm (20) is coaxially fixed with a driven bevel gear (18), the driven bevel gear (18) is meshingly connected with a driving bevel gear (17), and the driving bevel gear (17) and the fixed pendulum rod (12) are coaxially fixed.

8. A safety performance testing device for new energy vehicle batteries according to claim 7, characterized in that: When the battery pack (26) is at the lowest point in the vertical travel direction, the electrical copper sheet (28) is completely submerged in the salt water level line.

9. A safety performance testing method for a new energy vehicle battery, applied to a safety performance testing device for a new energy vehicle battery as described in any one of claims 1 to 8, comprising the following steps: S1. Preparation: Place the battery pack (26) on the conveying device (2), ensure that the device is in the starting state, add an appropriate amount of salt water into the water tank (1), and make the salt water level be below the level of the copper sheet (28) for connecting the power supply; S2, drop test: the battery pack (26) falls freely onto the support plate (3), simulating the physical impact that may occur during actual use, transportation or accidental drop; S3, water immersion detection: as the battery pack (26) gradually sinks into the salt water, the salt water level gradually rises, the salt water begins to contact the copper sheet (28), and the contact area gradually increases, and the resistance value of the circuit where the copper sheet (28) is located gradually decreases. The safety performance of the battery pack (26) is judged by detecting the presence or absence of a pressure signal; S4, lifting and moving: after the detection is completed, the horizontal height of the support plate (3) can be automatically raised to lift the battery pack (26) out of the salt water and rise to the set transfer position; S5, component reset: after a single test is completed, the horizontal height of the support plate (3) is lowered to the initial position, and the components used for water immersion testing are automatically restored to the initial position to prepare for the next test.

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