A new energy automobile battery open circuit failure test device under high temperature environment

Abstract

This invention relates to the field of battery testing technology, specifically to a test device for open-circuit failure of new energy vehicle batteries under high-temperature conditions. The device includes a frame with a support platform fixed on it for placing the battery. First side heating plates are symmetrically arranged on both sides of the support platform, and a second side heating plate is arranged on one side of each first side heating plate. An upper heating plate is positioned above the support platform. Heating elements for heating the battery are fixedly installed on the first side heating plates, the second side heating plates, and the upper heating plate. The two first side heating plates are slidably mounted on the frame, and the upper heating plate is fixed to a lifting rod. The lifting rod is driven to move up and down by a first drive mechanism set on the frame. This invention, through a single drive source and linkage mechanism, achieves synchronous and uniform surrounding and distance adjustment of the battery by all heating plates, thereby enabling convenient and linear control of heating intensity, accurate simulation of different high-temperature environments, and effectively improving the efficiency and accuracy of high-temperature open-circuit failure testing of batteries.

Description

Technical Field

[0001] This invention relates to the field of battery testing technology, specifically to an open-circuit failure test device for new energy vehicle batteries under high-temperature conditions. Background Technology

[0002] High-temperature safety testing of power batteries for new energy vehicles is a key step in product development and quality verification. Under high-temperature conditions, especially when not in operation, the internal chemical and electrochemical stability of batteries faces severe challenges, which may lead to capacity decay, voltage drop, or even thermal failure. Therefore, constructing a test device that can accurately simulate different high-temperature conditions and test the open-circuit voltage decay characteristics of batteries is of great value for battery failure mechanism research, thermal management design, and safety assessment.

[0003] Currently, common high-temperature testing methods mainly rely on heating from a heat source at a fixed distance to raise the temperature. Such devices create a high-temperature environment by heating the air, and their temperature control depends on the feedback adjustment of the ambient air temperature. However, this method has obvious limitations: First, the response speed of temperature changes is slow, making it difficult to quickly reach the set temperature or achieve complex temperature cycles; second, and more importantly, its temperature regulation depends entirely on the power control of the heating element and complex temperature control algorithms. Once set, the relative position of the heating element and the battery is fixed, making it impossible to quickly and linearly change the boundary conditions of the heat flow input during testing.

[0004] To improve heating efficiency and uniformity, existing technologies have introduced solutions that attach or closely arrange electric heating elements on the battery surface. However, this fixed or non-adjustable heating method results in a fixed thermal coupling strength. To change the heating intensity of the battery or simulate different thermal shock conditions, it is necessary to replace the heating element, adjust its power, or modify the complex control program. This is cumbersome, lacks flexibility, and makes it difficult to achieve continuous and linear adjustment of the heating intensity. Therefore, existing technologies lack a high-temperature testing device that can continuously and accurately control the heating intensity of the battery through simple mechanical adjustments without changing the power of the heating element and the control logic. To address this, we provide an open-circuit failure testing device for new energy vehicle batteries under high-temperature conditions to solve the aforementioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide an open-circuit failure test device for new energy vehicle batteries under high-temperature conditions. Through a linkage mechanism, the heating plate surrounding the battery can move closer to or further away from the battery synchronously. By changing the physical parameter of distance, the heat flux density and final stable temperature of the battery can be directly and linearly adjusted, so as to achieve convenient and accurate testing of the battery open-circuit performance under different temperature conditions and solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An open-circuit failure test device for new energy vehicle batteries under high temperature environment includes a frame, a support platform for placing batteries is fixed on the frame, a first side heating plate is symmetrically arranged on both sides of the support platform, a second side heating plate is arranged on one side of the first side heating plate, and an upper heating plate is arranged above the support platform. Heating elements for heating the battery are fixedly installed on the first side heating plate, the second side heating plate, and the upper heating plate.

[0008] Two first side heating plates are slidably mounted on the frame, and the upper heating plate is fixed on the lifting rod. The lifting rod is driven to rise and fall by a first driving mechanism provided on the frame. The upper heating plate and the first side heating plate are connected by a first linkage mechanism. When the upper heating plate rises and falls, it will drive the two first side heating plates to move synchronously in opposite directions or towards each other. The first side heating plate and the second side heating plate are connected by a second linkage mechanism. When the two first side heating plates move synchronously in opposite directions or towards each other, it will drive the two second side heating plates to move synchronously away from or towards the first side heating plate.

[0009] The support platform is fixedly equipped with test terminals for electrical connection with the battery electrodes. The test terminals are signal-connected to the battery test host fixedly installed on the frame to monitor the open circuit voltage and voltage decay characteristics of the battery under different temperature conditions.

[0010] The above-mentioned open-circuit failure test device for new energy vehicle batteries under high temperature environment: the first drive mechanism includes a cylinder fixed on the frame, the output end of the cylinder is provided with a piston rod, and the lifting rod is fixed to the end of the piston rod.

[0011] As described above, an open-circuit failure test device for new energy vehicle batteries under high-temperature conditions includes: a first linkage mechanism comprising a first mounting base fixed on a frame, on which two bidirectional worm gears are rotatably mounted; the two bidirectional worm gears are connected by a first gear mechanism; when one bidirectional worm gear rotates, it drives the other bidirectional worm gear to rotate in the opposite direction; a mounting frame is fixed on the frame, and a rotating sleeve sleeved on a lifting rod is rotatably mounted on the mounting frame; the rotating sleeve and the lifting rod are connected by a slotted roller mechanism; when the lifting rod moves axially within the rotating sleeve, it drives the rotating sleeve to rotate; and the rotating sleeve on the mounting frame... A second drive shaft is installed, and the second drive shaft is engaged with the rotating sleeve through a first pulley mechanism. When the rotating sleeve rotates, it drives the second drive shaft to rotate synchronously. The second drive shaft is engaged with one of the bidirectional worm gears through a second gear mechanism. When the second drive shaft rotates, it drives the bidirectional worm gear to rotate synchronously. Two sliding seats are slidably arranged on the first mounting base through a first limiting component. The first drive shaft is rotatably mounted on the sliding seats. A worm wheel that meshes with the two bidirectional worm gears is fixed on the first drive shaft. A support seat is fixed on the sliding seats. The first side heating plate is fixedly mounted on the support seat.

[0012] An open-circuit failure test device for a new energy vehicle battery under high temperature environment, as described above: the first gear mechanism includes synchronous gears that are rotatably mounted on a first mounting base and respectively fixed to the end of a bidirectional worm gear, and the two synchronous gears mesh with each other.

[0013] The above-mentioned open-circuit failure test device for new energy vehicle batteries under high temperature environment: the groove rolling mechanism includes a spiral guide groove formed on the surface of the lifting rod and a ball bearing that is rolled and embedded in the inner wall of the rotating sleeve, wherein the ball bearing is in rolling cooperation with the spiral guide groove.

[0014] The above-described open-circuit failure test device for a new energy vehicle battery under high temperature conditions includes a first pulley mechanism comprising a driving pulley fixed on a rotating sleeve and a driven pulley fixed on a second transmission shaft, wherein the driving pulley and the driven pulley are driven by a synchronous belt.

[0015] The above-mentioned open-circuit failure test device for new energy vehicle batteries under high temperature environment: the second gear mechanism includes a driving bevel gear fixed on a second transmission shaft and a driven bevel gear fixed on a bidirectional worm gear, wherein the driving bevel gear meshes with the driven bevel gear.

[0016] The above-described open-circuit failure test device for a new energy vehicle battery under high temperature conditions: the first limiting component includes two symmetrically distributed guide rods fixed on the first mounting base, the guide rods passing through the sliding base.

[0017] The above-described open-circuit failure test device for a new energy vehicle battery under high temperature conditions includes: the second linkage mechanism includes a support frame slidably mounted on a sliding seat, a second side heating plate fixedly mounted on the support frame, a gear and rack mechanism cooperating between the first transmission shaft and the support frame, the first transmission shaft rotating will drive the support frame to move, and a second limiting component is provided on the sliding seat when the support frame moves.

[0018] An open-circuit failure test device for a new energy vehicle battery under high temperature environment, as described above: the gear and rack mechanism includes a rack slidably disposed on a sliding seat and a gear fixed on a first transmission shaft, the gear meshing with the rack, and the support frame fixed to the end of the rack;

[0019] The second limiting component includes an inverted chamfered limiting block fixed on a sliding seat, the rack and inverted chamfered limiting block being slidably engaged, and a connecting rod being fixed between the two support frames, the connecting rod passing through the support seat.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting up a linkage mechanism, the present invention only needs to control a single drive source to drive the lifting rod to rise and fall, which can synchronously drive all lateral heating plates, including the first side heating plate, the second side heating plate and the upper heating plate, to move closer to or away from the center of the battery. By changing the distance between the heating element and the battery surface, the heat flux density can be directly and linearly adjusted, thereby realizing continuous and precise control of the battery heating intensity. There is no need to replace the heating element or frequently adjust the complex heating power and control program. Different intensities of thermal shock or different steady-state temperature conditions can be quickly simulated in a single test, which greatly improves the testing efficiency and the convenience of operation.

[0021] Furthermore, when the first driving mechanism drives the upper heating plate to descend, the first linkage mechanism drives the two first side heating plates to move synchronously towards each other along the linear guide rail. At the same time, the movement of each first side heating plate is also driven by the second linkage mechanism to always move synchronously with the first side heating plate. Ultimately, this invention ensures that all circumferential heating surface first and second side heating plates can always move parallel and equidistantly to the corresponding side of the battery as they approach or move away from the battery. This provides the battery with highly uniform and symmetrical thermal boundary conditions, which effectively avoids local overheating or underheating caused by uneven spacing between the heating surface and the battery surface, eliminates additional temperature gradients, and makes the battery's heating state completely determined by the preset spacing and heating power. This makes the open circuit failure test data more accurate and more repeatable. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a test device for open-circuit failure of new energy vehicle batteries under high-temperature conditions.

[0023] Figure 2 for Figure 1 A schematic diagram of the decomposed part of the structure.

[0024] Figure 3 for Figure 2 A schematic diagram of the decomposed part of the structure.

[0025] Figure 4 for Figure 3 A schematic diagram of the decomposed part of the structure.

[0026] Figure 5 for Figure 4 A schematic diagram of the decomposed part of the structure.

[0027] Figure 6 for Figure 5 A schematic diagram of the decomposed part of the structure.

[0028] Figure 7 To be Figure 6 This is a diagram showing the ball bearings in the rotating sleeve on one side after they have been removed from the hemispherical recess.

[0029] Figure 8 for Figure 5 A schematic diagram of the decomposed part of the structure.

[0030] Figure 9 for Figure 8 Enlarged structural diagram at point A in the middle.

[0031] Figure 10 for Figure 8 A schematic diagram of the decomposed part of the structure.

[0032] Figure 11 for Figure 8 A schematic diagram of the decomposed part of the structure.

[0033] In the diagram: 1. Frame; 2. Support platform; 3. First side heating plate; 4. Second side heating plate; 5. Upper heating plate; 6. Heating element; 7. Lifting rod; 8. Cylinder; 9. Piston rod; 10. Test terminal; 11. First mounting base; 12. Bidirectional worm gear; 13. Synchronous gear; 14. Sliding seat; 15. Guide rod; 16. First drive shaft; 17. Worm gear; 18. Gear; 19. Rack; 20. Support frame; 21. C-shaped limit block; 22. Connecting rod; 23. Support base; 24. Mounting frame; 25. Rotating sleeve; 26. Helical guide groove; 27. Ball bearing; 28. Second drive shaft; 29. ​​Driving pulley; 30. Driven pulley; 31. Synchronous belt; 32. Driving bevel gear; 33. Driven bevel gear; 34. Battery testing host. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] Please see Figures 1-11 As an embodiment of the present invention, an open circuit failure test device for a new energy vehicle battery under high temperature environment includes a frame 1, a support platform 2 for placing the battery is fixed on the frame 1, a first side heating plate 3 is symmetrically arranged on both sides of the support platform 2, a second side heating plate 4 is arranged on one side of the first side heating plate 3, and an upper heating plate 5 is arranged above the support platform 2. Heating elements 6 for heating the battery are fixedly installed on the first side heating plate 3, the second side heating plate 4, and the upper heating plate 5.

[0036] Two first-side heating plates 3 are slidably mounted on the frame 1, and the upper heating plate 5 is fixed on the lifting rod 7. The lifting rod 7 is driven to rise and fall by the first driving mechanism set on the frame 1. The upper heating plate 5 and the first-side heating plate 3 are connected by the first linkage mechanism. When the upper heating plate 5 rises and falls, it will drive the two first-side heating plates 3 to move synchronously in opposite directions or towards each other. The first-side heating plate 3 and the second-side heating plate 4 are connected by the second linkage mechanism. When the two first-side heating plates 3 move synchronously in opposite directions or towards each other, it will drive the two second-side heating plates 4 to move synchronously away from or towards the first-side heating plate 3.

[0037] Test terminals 10 for electrical connection with battery electrodes are fixedly installed on the support platform 2. The test terminals 10 are connected to the battery test host 34 fixedly installed on the frame 1 to monitor the open circuit voltage and voltage decay characteristics of the battery under different temperature conditions.

[0038] In this embodiment, during use, the battery to be tested is first placed on the support platform 2, and its electrodes are reliably connected to the test terminals 10. The first drive mechanism is activated, driving the lifting rod 7 to move the upper heating plate 5 downward. The downward movement of the upper heating plate 5 is transmitted to the two first side heating plates 3 through the first linkage mechanism, forcing them to move synchronously towards each other on the frame 1, moving from both sides of the battery towards the center. At the same time, the movement of each first side heating plate 3 is also driven by the second linkage mechanism to produce a corresponding linkage with its adjacent second side heating plate 4, causing the second side heating plate 4 to also move towards the center of the battery. Through this series of linked mechanical movements, the upper heating plate 5, the two first side heating plates 3, and the two second side heating plates 4 finally approach and surround the battery uniformly and synchronously from above and all sides until a preset distance parallel to each surface of the battery is reached. At this time, the heating elements 6 on all heating plates begin to work. Heating element 6 can be an electric heating tube or electric heating wire to heat the battery. Preferably, a temperature sensor can be set on the battery surface to monitor the battery surface temperature in real time. By precisely controlling the lifting stroke of the lifting rod 7, the overall distance between all heating elements 6 and the battery surface can be adjusted linearly and continuously, thereby directly and conveniently changing the heat flux density applied to the battery and achieving precise control of different heating intensities to simulate various high-temperature environments from mild to severe. The battery test host 34 continuously monitors the open-circuit voltage of the battery under the controlled thermal environment and its change over time through the test terminal 10 and the feedback from the temperature sensor, thereby evaluating its open-circuit failure characteristics under high-temperature conditions. After the test, the first drive mechanism reverses its action, driving the upper heating plate 5 to rise. The linkage mechanism makes the first side heating plate 3 and the second side heating plate 4 move away from the battery simultaneously, so that the battery under test can be easily removed.

[0039] As a further embodiment of the present invention, the first driving mechanism includes a cylinder 8 fixed on the frame 1, a piston rod 9 is provided at the output end of the cylinder 8, and a lifting rod 7 is fixed at the end of the piston rod 9.

[0040] In this embodiment, after the cylinder 8 is started, the piston rod 9 at its output end performs linear extension and retraction, thereby driving the lifting rod 7, which is fixedly connected to the end of the piston rod 9, to perform vertical lifting and retraction, providing initial power for the entire linkage system.

[0041] As a further embodiment of the present invention, the first linkage mechanism includes a first mounting base 11 fixed on the frame 1. Two bidirectional worm gears 12 are rotatably mounted on the first mounting base 11. The two bidirectional worm gears 12 are driven by a first gear mechanism. When one bidirectional worm gear 12 rotates, it drives the other bidirectional worm gear 12 to rotate in the opposite direction. A mounting frame 24 is fixed on the frame 1. A rotating sleeve 25 sleeved on the lifting rod 7 is rotatably mounted on the mounting frame 24. The rotating sleeve 25 and the lifting rod 7 are engaged by a grooved roller mechanism. When the lifting rod 7 moves axially within the rotating sleeve 25, it drives the rotating sleeve 25 to rotate. A second transmission shaft 28 is rotatably mounted on the mounting frame 24. The second drive shaft 28 is connected to the rotating sleeve 25 via a first pulley mechanism. When the rotating sleeve 25 rotates, it drives the second drive shaft 28 to rotate synchronously. The second drive shaft 28 is connected to a bidirectional worm gear 12 via a second gear mechanism. When the second drive shaft 28 rotates, it drives the bidirectional worm gear 12 to rotate synchronously. Two sliding seats 14 are slidably arranged on the first mounting base 11 via a first limiting component. The first drive shaft 16 is rotatably mounted on the sliding seat 14. A worm wheel 17 that meshes with the two bidirectional worm gears 12 is fixed on the first drive shaft 16. A support seat 23 is fixed on the sliding seat 14. The first side heating plate 3 is fixedly mounted on the support seat 23.

[0042] In this embodiment, the vertical lifting motion of the lifting rod 7 is converted into the rotational motion of the rotating sleeve 25 through the grooved roller mechanism. The rotating sleeve 25 transmits the rotational motion to the second transmission shaft 28 through the first pulley mechanism. The second transmission shaft 28 then drives one of the bidirectional worm gears 12 to rotate through the second gear mechanism. Since the two bidirectional worm gears 12 are meshed through the first gear mechanism, they always maintain synchronous rotation in opposite directions. The bidirectional worm gear 12 meshes with the worm wheel 17. When the bidirectional worm gear 12 rotates, it drives the meshed worm wheel 17 and the first transmission shaft 16 fixed to it to move along the direction of the axis of the bidirectional worm gear 12. Since the first transmission shaft 16 is rotatably mounted on the sliding seat 14, and the sliding seat 14 is restricted to sliding only in the horizontal direction by the first limiting component, the movement of the first transmission shaft 16 will drive the entire sliding seat 14 and the support seat 23 and the first side heating plate 3 fixed on the sliding seat 14 to move horizontally. Since the two bidirectional worm gears 12 rotate synchronously in opposite directions, they drive the two sliding seats 14 and the first side heating plate 3 on them to move synchronously horizontally in opposite directions.

[0043] As a further embodiment of the present invention, the first gear mechanism includes synchronous gears 13 that are rotatably mounted on the first mounting base 11 and respectively fixed to the ends of the bidirectional worm gear 12, with the two synchronous gears 13 meshing with each other.

[0044] In this embodiment, the two synchronous gears 13 have the same module and number of teeth and mesh with each other. When one synchronous gear 13 is driven to rotate, it will drive the other synchronous gear 13 meshing with it to rotate at the same speed but in the opposite direction, thereby ensuring that the rotation of the two bidirectional worm gears 12 is strictly synchronized and in opposite directions.

[0045] As a further embodiment of the present invention, the grooved rolling mechanism includes a spiral guide groove 26 formed on the surface of the lifting rod 7 and a ball bearing 27 that is rolled and embedded in the inner wall of the rotating sleeve 25. The ball bearing 27 rolls and engages with the spiral guide groove 26. The inner wall of the rotating sleeve 25 is provided with a hemispherical recess, and the outer half of the ball bearing 27 is rolled and embedded in the hemispherical recess, while the inner half rolls in the spiral guide groove 26.

[0046] In this embodiment, when the lifting rod 7 moves linearly up and down under the drive of the cylinder 8, the spiral guide groove 26 on its surface moves accordingly. Since the ball bearing 27 is constrained in the rotating sleeve 25 and rolls with the spiral guide groove 26, the linear motion of the lifting rod 7 is converted into a tangential thrust on the ball bearing 27 by the limiting effect of the inclined groove of the spiral guide groove 26, thereby forcing the rotating sleeve 25 to rotate around its axis. The lead of the spiral guide groove 26 determines the rotation angle of the rotating sleeve 25 corresponding to the unit stroke of the lifting rod 7.

[0047] As a further embodiment of the present invention, the first pulley mechanism includes a driving pulley 29 fixed on the rotating sleeve 25 and a driven pulley 30 fixed on the second transmission shaft 28. The driving pulley 29 and the driven pulley 30 are driven by a synchronous belt 31.

[0048] In this embodiment, the rotation of the rotating sleeve 25 drives the driving pulley 29 on it to rotate synchronously, and the power is transmitted to the driven pulley 30 through the synchronous belt 31, thereby driving the second transmission shaft 28 to rotate. The pulley drive realizes the change of power transmission direction, and the transmission ratio can be adjusted by selecting different pulley diameter ratios.

[0049] As a further embodiment of the present invention, the second gear mechanism includes a driving bevel gear 32 fixed on the second transmission shaft 28 and a driven bevel gear 33 fixed on a bidirectional worm gear 12, wherein the driving bevel gear 32 meshes with the driven bevel gear 33.

[0050] In this embodiment, the rotation of the second drive shaft 28 drives the active bevel gear 32 at its end to rotate, and the driven bevel gear 33 meshing with the active bevel gear 32 transmits power to the corresponding bidirectional worm gear 12, thereby driving the bidirectional worm gear 12 to rotate.

[0051] As a further embodiment of the present invention, the first limiting component includes two symmetrically distributed guide rods 15 fixed on the first mounting base 11, the guide rods 15 passing through the sliding base 14.

[0052] In this embodiment, the guide rod 15 provides precise linear guidance for the movement of the sliding seat 14, restricting the sliding seat 14 to slide only along the axial direction of the guide rod 15, preventing it from deviating or rotating in other directions, and ensuring the straightness and accuracy of the movement of the first side heating plate 3.

[0053] As a further embodiment of the present invention, the second linkage mechanism includes a support frame 20 slidably disposed on the sliding seat 14, a second side heating plate 4 fixedly installed on the support frame 20, and a first transmission shaft 16 cooperating with the support frame 20 through a gear and rack mechanism. When the first transmission shaft 16 rotates, it will drive the support frame 20 to move. A second limiting component is provided on the sliding seat 14 when the support frame 20 moves.

[0054] In this embodiment, when the first linkage mechanism drives the sliding seat 14 and the first transmission shaft 16 to move horizontally, the first transmission shaft 16 itself also rotates. This rotation is converted into linear movement of the support frame 20 relative to the sliding seat 14 through the gear and rack mechanism. Since the second side heating plate 4 is fixed on the support frame 20, the movement of the second side heating plate 4 relative to the first side heating plate 3 is realized, so that the second side heating plate 4 moves towards or away from the first side heating plate 3.

[0055] As a further embodiment of the present invention, the gear and rack mechanism includes a rack 19 slidably disposed on a sliding seat 14 and a gear 18 fixed on a first transmission shaft 16. The gear 18 meshes with the rack 19, and the support frame 20 is fixed to the end of the rack 19.

[0056] The second limiting component includes an incline limiting block 21 fixed on the sliding seat 14, a rack 19 slidingly engaging with the incline limiting block 21, and a connecting rod 22 fixed between the two support frames 20, the connecting rod 22 passing through the support seat 23.

[0057] In this embodiment, when the first drive shaft 16 rotates, the gear 18 on it drives the rack 19 meshing with it to move in a direction perpendicular to the sliding seat 14. The movement of the rack 19 drives the support frame 20 fixed at its end and the second side heating plate 4 to move together. The U-shaped limiting block 21 provides guidance for the movement of the rack 19. The connecting rod 22 passes through the support seat 23, but the two are not fixed and are allowed to slide relative to each other, thereby ensuring that the movements of the first side heating plate 3 and the second side heating plate 4 are both related to each other and can independently meet their respective movement trajectory requirements. At the same time, the support seat 23 provides movement guidance for the connecting rod 22.

[0058] The working principle of this invention is as follows: The invention uses a driving cylinder 8 to drive the vertical movement of the lifting rod 7, which is then converted into the vertical movement of the upper heating plate 5, the horizontal opposing and opposing movements of the two first-side heating plates 3, and the movement of the two second-side heating plates 4 via a series of mechanical linkage mechanisms. Ultimately, this achieves the synchronous and coordinated movement of all heating plates around or away from the battery. Specifically, the cylinder 8 drives the lifting rod 7 to rise and fall. The linear movement of the lifting rod 7 is converted into the rotational movement of the rotating sleeve 25 through a cooperating grooved roller mechanism. The rotation of the rotating sleeve 25 is transmitted to the second transmission shaft 28 through a first pulley mechanism. The rotation of the second transmission shaft 28 is then changed in direction through a second gear mechanism, driving one of the bidirectional worm gears 12 to rotate. The two bidirectional... The worm gears 12 are linked by a first gear mechanism consisting of two meshing synchronous gears 13, ensuring that they always rotate in opposite directions synchronously. The rotation of the bidirectional worm gear 12 drives the worm wheel 17 meshing with it to produce a horizontal displacement. This displacement drives the first transmission shaft 16, on which the worm wheel 17 is mounted, and the sliding seat 14 connected to it to move horizontally along the guide rod 15, thereby realizing the horizontal movement of the first side heating plate 3 fixed on the support base 23. At the same time, the rotation of the first transmission shaft 16 drives the support frame 20 to move relative to the sliding seat 14 through a gear and rack mechanism consisting of a gear 18 and a rack 19, thereby causing the second side heating plate 4 fixed on the support frame 20 to move closer to or away from the first side heating plate 3.

[0059] The above embodiments are exemplary and not restrictive. Therefore, any technical solutions that can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention are included within the scope of the present invention.

Claims

1. A test device for open-circuit failure of new energy vehicle batteries under high-temperature environment, comprising a frame (1), characterized in that, The frame (1) is fixed with a support platform (2) for placing batteries. A first side heating plate (3) is symmetrically arranged on both sides of the support platform (2). A second side heating plate (4) is arranged on one side of the first side heating plate (3). An upper heating plate (5) is arranged above the support platform (2). Heating elements (6) for heating the batteries are fixedly installed on the first side heating plate (3), the second side heating plate (4), and the upper heating plate (5). Two first side heating plates (3) are slidably mounted on the frame (1). The upper heating plate (5) is fixed on the lifting rod (7). The lifting rod (7) is driven to lift and lower by the first driving mechanism set on the frame (1). The upper heating plate (5) and the first side heating plate (3) are connected by the first linkage mechanism. When the upper heating plate (5) lifts and lowers, it will drive the two first side heating plates (3) to move synchronously in opposite directions or towards each other. The first side heating plate (3) and the second side heating plate (4) are connected by the second linkage mechanism. When the two first side heating plates (3) move synchronously in opposite directions or towards each other, it will drive the two second side heating plates (4) to move synchronously away from or towards the first side heating plate (3). The support platform (2) is fixedly installed with test terminals (10) for electrical connection with the battery electrodes. The test terminals (10) are signal connected to the battery test host (34) fixedly installed on the frame (1) to monitor the open circuit voltage and voltage decay characteristics of the battery under different temperature conditions. The first linkage mechanism includes a first mounting base (11) fixed on the frame (1). Two bidirectional worm gears (12) are rotatably mounted on the first mounting base (11). The two bidirectional worm gears (12) are driven by a first gear mechanism. When one bidirectional worm gear (12) rotates, it will drive the other bidirectional worm gear (12) to rotate in the opposite direction. A mounting frame (24) is fixed on the frame (1). A rotating sleeve (25) sleeved on the lifting rod (7) is rotatably mounted on the mounting frame (24). The rotating sleeve (25) and the lifting rod (7) are driven by a grooved roller mechanism. When the lifting rod (7) moves axially within the rotating sleeve (25), it will drive the rotating sleeve (25) to rotate. A second transmission shaft (28) is rotatably mounted on the mounting frame (24). The second transmission shaft (28) and the rotating sleeve (25) are driven by a first pulley mechanism. When the rotating sleeve (25) rotates, it will drive the second transmission shaft (28) to rotate synchronously. The second transmission shaft (28) and one bidirectional worm gear... The rods (12) are connected by a second gear mechanism. When the second transmission shaft (28) rotates, it will drive a bidirectional worm (12) to rotate synchronously. Two sliding seats (14) are slidably arranged on the first mounting base (11) through a first limiting component. A first transmission shaft (16) is rotatably mounted on the sliding seat (14). A worm wheel (17) that meshes with the two bidirectional worms (12) is fixed on the first transmission shaft (16). A support seat (23) is fixed on the sliding seat (14). The first side heating plate (3) is fixedly installed on the support seat (23). The second linkage mechanism includes a support frame (20) slidably arranged on the sliding seat (14). The second side heating plate (4) is fixedly installed on the support frame (20). The first transmission shaft (16) and the support frame (20) are connected by a gear and rack mechanism. When the first transmission shaft (16) rotates, it will drive the support frame (20) to move. A second limiting component is provided on the sliding seat (14) when the support frame (20) moves.

2. The open-circuit failure test device for new energy vehicle batteries under high-temperature environment according to claim 1, characterized in that, The first drive mechanism includes a cylinder (8) fixed on the frame (1), and a piston rod (9) is provided at the output end of the cylinder (8). The lifting rod (7) is fixed at the end of the piston rod (9).

3. The open-circuit failure test device for new energy vehicle batteries under high-temperature environment according to claim 1, characterized in that, The first gear mechanism includes synchronizing gears (13) that are fixed to the ends of a bidirectional worm (12) and rotatably mounted on a first mounting base (11), and the two synchronizing gears (13) mesh with each other.

4. The open-circuit failure test device for new energy vehicle batteries under high-temperature environment according to claim 1, characterized in that, The grooved rolling mechanism includes a spiral guide groove (26) formed on the surface of the lifting rod (7) and a ball (27) that is rolled and embedded in the inner wall of the rotating sleeve (25). The ball (27) rolls and engages with the spiral guide groove (26).

5. The open-circuit failure test device for new energy vehicle batteries under high-temperature environment according to claim 1, characterized in that, The first pulley mechanism includes a driving pulley (29) fixed on a rotating sleeve (25) and a driven pulley (30) fixed on a second transmission shaft (28). The driving pulley (29) and the driven pulley (30) are driven by a synchronous belt (31).

6. The open-circuit failure test device for new energy vehicle batteries under high-temperature environment according to claim 1, characterized in that, The second gear mechanism includes a driving bevel gear (32) fixed on a second transmission shaft (28) and a driven bevel gear (33) fixed on a bidirectional worm gear (12), wherein the driving bevel gear (32) meshes with the driven bevel gear (33).

7. The open-circuit failure test device for new energy vehicle batteries under high-temperature environment according to claim 1, characterized in that, The first limiting component includes two symmetrically distributed guide rods (15) fixed on the first mounting base (11), and the guide rods (15) are disposed through the sliding base (14).

8. The open-circuit failure test device for new energy vehicle batteries under high-temperature environment according to claim 1, characterized in that, The gear and rack mechanism includes a rack (19) slidably disposed on a sliding seat (14) and a gear (18) fixed on a first transmission shaft (16). The gear (18) meshes with the rack (19), and the support frame (20) is fixed to the end of the rack (19). The second limiting component includes an incline limiting block (21) fixed on a sliding seat (14), the rack (19) slides with the incline limiting block (21), and a connecting rod (22) is fixed between the two support frames (20), the connecting rod (22) passing through the support seat (23).

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