Electric vehicle battery cold resistance detection device

Abstract

The application discloses an electric vehicle battery anti-cold performance detection device and relates to the technical field of electric vehicle battery detection.The device comprises a supporting base, the upper end surface of the supporting base is circumferentially provided with a plurality of refrigeration boxes, the upper side of the supporting base is connected with an upper side plate, the upper side plate is circumferentially provided with a plurality of fans corresponding to the refrigeration boxes, and the supporting base is provided with a synchronous power connection assembly matched with each power line.The application places a plurality of battery groups with negative plates of different components into corresponding refrigeration boxes, relies on fan operation to consume electricity, and relies on wind power to make the fan blades horizontally move to corresponding positions.When the battery groups are sequentially consumed, the corresponding fans are stopped, then the corresponding fan blades are reset under the action of spring elasticity, the corresponding clamping blocks are clamped into the corresponding annular clamping grooves on the lifting columns in the process, and therefore the clamping blocks corresponding to the battery groups sequentially consumed can be distributed at different height positions for direct comparison and judgment.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle battery testing technology, and specifically to a device for testing the cold resistance performance of electric vehicle batteries. Background Technology

[0002] Electric vehicles are becoming increasingly common and have become a common means of transportation. Electric vehicles mainly rely on batteries for power, but the range of batteries will decrease in low-temperature environments. Therefore, the development of low-temperature resistant batteries is needed to change this situation. It is currently believed that the capacity decay of batteries at low temperatures is mainly limited by the negative plate. Therefore, it is relatively quick to change the negative plate formula. Then, the cold resistance performance of batteries with different negative plates is tested.

[0003] Existing battery cold resistance testing devices include low-temperature chambers, which involve placing the battery inside the chamber to expose it to low temperatures, discharging the battery, measuring the discharge amount or battery life, and then judging the battery's cold resistance based on these data.

[0004] The shortcomings of existing battery cold resistance performance testing devices are as follows: when the battery is placed in a low-temperature environment for discharge testing, some data needs to be recorded manually. When testing multiple groups of different batteries, multiple sets of data need to be recorded and then compared together. In other words, it is not possible to directly compare and determine the battery group with the best performance after the test is completed, which makes the testing operation inconvenient. Summary of the Invention

[0005] The purpose of this invention is to provide a device for testing the cold resistance performance of electric vehicle batteries, so as to solve the technical problem that the testing operation is not convenient enough when testing multiple groups of batteries in the prior art.

[0006] The technical problem to be solved by this invention can be achieved through the following technical solution:

[0007] A device for testing the cold resistance performance of an electric vehicle battery includes a support base, wherein multiple refrigeration boxes are circumferentially distributed on the upper surface of the support base.

[0008] A top side plate is connected above the support base. Multiple fans corresponding to the refrigeration boxes are circumferentially arranged on the top side plate. Each fan is equipped with a power cord. A synchronous power connection component is provided on the support base to connect with each power cord, and each refrigeration box is also connected to the synchronous power connection component. A connecting vertical plate is provided on one side of the air outlet of each fan, and the connecting vertical plate is fixedly connected to the top side plate. A fan blade is provided on the side of each connecting vertical plate near the corresponding fan. A guide rod is connected to the fan blade, and the guide rod passes through the corresponding connecting vertical plate. A first spring connects the guide rod and the connecting vertical plate. Multiple sets of trigger switches are circumferentially distributed on the top side plate, and each set of trigger switches is connected to a corresponding guide rod.

[0009] The upper side plate is connected to a stepper electric push rod that is electrically connected to the trigger switch group; the telescopic end of the stepper electric push rod is connected to a lifting column, and the lifting column has multiple annular slots distributed longitudinally; the top of each fan is connected to a connecting guide rail, and each connecting guide rail is slidably provided with an electric telescopic clip that cooperates with the annular slot, and the electric telescopic clip is electrically connected to the trigger switch group.

[0010] As a further aspect of the present invention: the synchronous power connection component includes a first electric telescopic rod and a set of conductive columns. The first electric telescopic rod is connected to the support base. The telescopic end of the first electric telescopic rod is connected to a lifting linkage plate. Multiple sets of conductive columns are provided and are circumferentially distributed on the lifting linkage plate. Each set of conductive columns penetrates the top of the corresponding refrigeration box. Each set of conductive columns is also electrically connected to the corresponding power line.

[0011] As a further embodiment of the present invention: each set of trigger switches includes a mounting slot, a pressure sensing switch and a trigger button switch. The mounting slot is formed on the upper side plate. A rotating plate is vertically and movably connected to the inner side of the mounting slot via a spring-loaded hinge. The pressure sensing switch is installed on the side of the rotating plate away from the connecting vertical plate. The trigger button switch is installed on the end of the mounting slot near the connecting vertical plate. A first roller is connected to the end of each guide rod away from the fan blade. Each trigger button switch is electrically connected to a stepper electric push rod.

[0012] As a further embodiment of the present invention: the electric telescopic clamp includes a second electric telescopic rod and a clamping block. The second electric telescopic rod is slidably connected to the connecting guide rail. The clamping block is disposed at the telescopic end of the second electric telescopic rod. The second electric telescopic rod is electrically connected to a corresponding pressure sensing switch. An elastic buffer is disposed between the clamping block and the corresponding telescopic end of the second electric telescopic rod.

[0013] As a further aspect of the present invention: the elastic buffer includes a slide rod and a second spring, the slide rod is connected to the locking block, the telescopic end of the second electric telescopic rod is provided with a sliding cavity, the slide rod slides through the sliding cavity, and the second spring is connected between the slide rod and the sliding cavity.

[0014] As a further aspect of the present invention, each of the fans is also provided with a timing device that cooperates with the corresponding fan blades.

[0015] As a further aspect of the present invention: the timing device includes a timer and a second roller. The timer is connected to the upper side of the fan housing, and a timing start / stop button switch is provided at the bottom of the timer. The second roller is connected to the top of the fan blades, and the second roller cooperates with the timing start / stop button switch.

[0016] As a further aspect of the present invention: a U-shaped limiting frame is connected to the inner bottom of the refrigeration box.

[0017] The beneficial effects of this invention are:

[0018] 1. This invention places multiple battery packs with different negative plates into corresponding refrigeration boxes, and connects each fan to its corresponding battery pack. The fans then operate, using airflow to move the blades laterally to their respective positions. When a battery pack's power is depleted, the corresponding fan stops, and the corresponding blades reset under spring force. During this process, a corresponding trigger switch group is activated, causing the corresponding second electric telescopic rod to engage the locking block in the corresponding annular slot on the lifting column. Each time, the lifting column is raised a certain distance by a stepper electric push rod. This allows the locking blocks corresponding to the sequentially depleted battery packs to be distributed at different heights, facilitating direct judgment of the optimal performance battery pack based on height differences, eliminating the need for data collection and comparison, thus simplifying testing.

[0019] 2. When each fan starts, the fan blades move laterally due to the wind force. During this process, the fan blades are activated by the second roller, which activates the start / stop button switch on the corresponding timer, causing the timer to start counting. When the fan stops, the fan blades return to their original position, and the second roller activates the start / stop button switch again, thus stopping the timer. This allows the battery pack's runtime to be recorded, making it convenient for testing personnel to understand the battery pack's endurance. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0023] Figure 3 This is a top view schematic diagram of the relative positional distribution of the card block and the lifting column in this invention;

[0024] Figure 4 This is a schematic diagram of the connection between the locking block and the second electric telescopic rod in this invention;

[0025] Figure 5 This is a top view schematic diagram of the U-shaped limiting frame and the refrigeration box connected in this invention.

[0026] In the diagram: 1. Support base; 2. Refrigeration box; 3. Conductive column assembly; 4. Upper side plate; 5. First electric telescopic rod; 6. Lifting linkage plate; 7. Power cord; 8. Stepper electric push rod; 9. Lifting column; 10. Annular slot; 11. Fan; 12. Second electric telescopic rod; 13. Connecting guide rail; 14. Battery pack; 15. Timer; 16. Timer start / stop button switch; 17. Locking block; 18. Second roller; 19. Fan blade; 20. Connecting vertical plate; 21. Trigger button switch; 22. Mounting slot; 23. Rotating plate; 24. Pressure sensor switch; 25. First roller; 26. First spring; 27. Guide rod; 28. Slide cavity; 29. ​​Second spring; 30. Slide rod; 31. U-shaped limit frame. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1-5 As shown, an electric vehicle battery cold resistance performance testing device includes a support base 1, with multiple refrigeration boxes 2 distributed circumferentially on the upper surface of the support base 1. The refrigeration boxes 2 are equipped with refrigeration components, which are used to create a low-temperature environment inside the refrigeration boxes 2. When it is necessary to test the cold resistance performance of the battery pack 14, the battery is placed inside the refrigeration box 2, the temperature is set, and then the battery is discharged to test the effective power supply time of the battery.

[0029] A U-shaped limiting frame 31 is fixedly connected to the bottom of the refrigeration box 2. When the battery pack 14 is placed inside the refrigeration box 2, the battery pack 14 is inserted into the U-shaped limiting frame 31. The U-shaped limiting frame 31 is used to position the battery pack 14 to ensure that it is in the corresponding position, which is convenient for subsequent testing operations.

[0030] The upper side plate 4 is connected to the support base 1 via a bracket. Multiple fans 11 corresponding to the refrigeration box 2 are arranged circumferentially on the upper side plate 4. Each fan 11 is equipped with a power cord 7. The support base 1 is equipped with a synchronous power connection component that is connected to each power cord 7. Each refrigeration box 2 is also connected to the synchronous power connection component.

[0031] The synchronous power connection assembly includes a first electric telescopic rod 5 and a conductive post group 3. The first electric telescopic rod 5 is fixedly connected to the center of the support base 1. The upper end of the first electric telescopic rod 5 is the telescopic end, and the telescopic end of the first electric telescopic rod 5 is connected to a lifting linkage plate 6. Multiple sets of conductive post groups 3 are provided and are circumferentially distributed on the lifting linkage plate 6. Each set of conductive post groups 3 penetrates the top of the corresponding refrigeration box 2. Each set of conductive post groups 3 is also electrically connected to the corresponding power line 7. When battery packs 14 with different negative electrode plates are placed in different positions in the refrigeration box 2, and the battery packs... After the battery pack 14 is placed, the conductive output end of the battery pack 14 is aligned with the corresponding conductive column group 3. Then, the low temperature is set, and finally the first electric telescopic rod 5 is controlled to retract. The first electric telescopic rod 5 then drives all the conductive column groups 3 to descend synchronously through the lifting linkage plate 6, going deeper into the refrigeration box 2. Finally, each group of conductive column groups 3 touches the conductive output end of the corresponding battery pack 14 to achieve power connection. In this way, each fan 11 distributed on the upper side plate 4 is powered on and runs, relying on the running fan 11 as a load to consume the electrical energy of the corresponding battery pack 14.

[0032] Each fan 11 has its air outlet facing the center of the upper side plate 4. Each fan 11 has a connecting vertical plate 20 on one side of its air outlet, and the connecting vertical plate 20 is fixedly connected to the upper side plate 4. Each connecting vertical plate 20 has a fan blade 19 on the side closest to the corresponding fan 11. A guide rod 27 is fixedly connected to the fan blade 19 and passes through the corresponding connecting vertical plate 20. A first spring 26 connects the guide rod 27 and the connecting vertical plate 20. Before the fan 11 is started, the corresponding fan blade 19 is located close to the air outlet of the fan 11. When the fan 11 is started, the airflow blows onto the fan blade 19. The fan blade 19 is subjected to air pressure and slides close to the corresponding connecting vertical plate 20 by relying on the guide rod 27. During this process, the first spring 26 is stretched to generate a rebound force. The upper side plate 4 has multiple sets of trigger switches distributed circumferentially, and each set of trigger switches cooperates with the corresponding guide rod 27.

[0033] Each set of trigger switches includes a mounting slot 22, a pressure sensing switch 24, and a trigger button switch 21. The mounting slot 22 is opened on the upper side plate 4, and the mounting slot 22 is located on the side of the corresponding connecting vertical plate 20 near the center of the upper side plate 4. The inner side of the mounting slot 22 is vertically connected to a rotating plate 23 via a spring-loaded hinge. The pressure sensing switch 24 is installed on the side of the rotating plate 23 away from the connecting vertical plate 20, and the trigger button switch 21 is installed on the end of the mounting slot 22 near the connecting vertical plate 20.

[0034] Each guide rod 27 has a first roller 25 connected to the end away from the fan blade 19. The first roller 25 is attached to the upper surface of the upper side plate 4, and the mounting groove 22 is on the movement trajectory of the first roller 25. When the fan 11 starts blowing air onto the fan blade 19, the guide rod 27 slides away from the fan 11. During this process, the first roller 25 rolls through the mounting groove 22 and only presses against the side of the corresponding rotating plate 23 where the pressure sensor switch 24 is not installed. At this time, the rotating plate 23 first deflects into the mounting groove 22 and does not press against the trigger button switch 21. After the first roller 25 passes through, the rotating plate 23 rotates back to its original position. When the fan 11 stops, the guide rod 27 slides back to its original position under the elastic force of the first spring 26. At this time, the first roller 25 passes through the mounting groove 22 again and presses against the side of the rotating plate 23 where the pressure sensor switch 24 is installed, causing the pressure sensor switch 24 to sense the pressure. Then the rotating plate 23 deflects and presses against the trigger button switch 21.

[0035] A stepper electric push rod 8, which is electrically connected to the trigger switch group, is fixedly connected in the middle of the upper side plate 4. Each trigger button switch 21 is electrically connected to the stepper electric push rod 8. That is, when the trigger button switch 21 is pressed, the stepper electric push rod 8 extends a certain distance, and the stepper electric push rod 8 extends once for each trigger button switch 21 being pressed.

[0036] The telescopic end of the stepper electric push rod 8 is fixedly connected to a lifting column 9. Multiple annular slots 10 are longitudinally distributed on the lifting column 9, and the distance between adjacent annular slots 10 is exactly the feed length of the stepper electric push rod 8 each time.

[0037] Each fan 11 is vertically fixed to the top of a connecting guide rail 13. Each connecting guide rail 13 is slidably provided with an electric telescopic clip that cooperates with the annular slot 10. The electric telescopic clip is electrically connected to the trigger switch group. The electric telescopic clips are distributed around the lifting column 9 in a circumferential direction.

[0038] The electric telescopic locking mechanism includes a second electric telescopic rod 12 and a locking block 17. The second electric telescopic rod 12 is slidably connected to the connecting guide rail 13 and is in a horizontal position. The second electric telescopic rod 12 is electrically connected to the corresponding pressure sensing switch 24. The locking block 17 is located at the telescopic end of the second electric telescopic rod 12. The initial position of the locking block 17 is aligned with the annular groove 10 at the highest position of the lifting column 9. When one of the battery packs 14 runs out of power first, the guide rod 27 slides back to its original position because the fan 11 stops. At this time, the first roller 25 first acts on the corresponding pressure sensing switch 24, and then acts on the trigger button switch 21. The pressure sensing switch 24 causes the corresponding second electric telescopic rod 12 to extend. Thus, the second electric telescopic rod 12 drives the corresponding locking block 17 to insert into the annular groove 10 at the highest position of the lifting column 9. After the second electric telescopic rod 12 drives the locking block 17 into the annular groove 10, The button switch 21 is pressed, and then the button switch 21 is pressed, which causes the stepper electric push rod 8 to extend, causing the lifting column 9 to rise a certain distance. Since the second electric telescopic rod 12 connected to the locking block 17 is slidably connected to the corresponding connecting guide rail 13, the locking block 17 that is locked in the annular locking groove 10 will rise accordingly. The locking blocks 17 in other positions will then align with the next annular locking groove 10 on the lifting column 9. When the next battery pack 14 runs out of power, the corresponding second electric telescopic rod 12 and the stepper electric push rod 8 will be triggered again, thereby causing another locking block 17 to rise. The locking blocks 17 that were originally connected to the lifting column 9 will rise synchronously and always remain in a high position. Finally, after all the battery packs 14 have run out of power, the height position of the locking block 17 corresponding to each battery pack 14 can be compared to determine which battery pack 14 has the longest battery life under the same low temperature conditions, thereby determining the battery pack 14 with the best performance.

[0039] An elastic buffer is provided between the locking block 17 and the corresponding telescopic end of the second electric telescopic rod 12. The elastic buffer includes a slide rod 30 and a second spring 29. The slide rod 30 is connected to the locking block 17. The telescopic end of the second electric telescopic rod 12 has a sliding cavity 28. The slide rod 30 slides through the sliding cavity 28. The second spring 29 is connected between the slide rod 30 and the sliding cavity 28. After the locking block 17 abuts against the inner wall of the annular locking groove 10 under the driving action of the second electric telescopic rod 12, it slides and retracts into the sliding cavity 28 by the slide rod 30 and compresses the second spring 29 to achieve impact buffering.

[0040] Each fan 11 is also equipped with a timing device that works in conjunction with the corresponding fan blade 19. The timing device includes a timer 15 and a second roller 18. The timer 15 is connected to the upper side of the fan 11 housing and is close to the corresponding fan blade 19. A timing start / stop button switch 16 is provided at the bottom of the timer 15. Pressing the timing start / stop button switch 16 once starts the timer 15, and pressing it again stops the timer 15. The second roller 18 is connected to the top of the fan blade 19 and works in conjunction with the timing start / stop button switch 16. The timing start / stop button switch 16 is located on the movement trajectory of the second roller 18.

[0041] When the fan 11 starts blowing air, causing the fan blades 19 to move laterally, the second roller 18 on the fan blades 19 presses against the timer start / stop button switch 16 once, causing the timer 15 to start timing. When the fan 11 stops, the fan blades 19 return to their original position, and the second roller 18 presses against the timer start / stop button switch 16 again, causing the timer 15 to stop timing. In this way, the tester can know the battery pack 14's battery life in low-temperature environments based on the duration displayed by the timer 15.

[0042] The working principle of this invention is as follows: First, multiple battery packs 14 with different negative plates are placed in the refrigeration boxes 2 at different positions. After the battery packs 14 are placed, the conductive output end of the battery pack 14 is aligned with the corresponding conductive post group 3. Then, the temperature of the low-temperature environment inside each refrigeration box 2 is set to be the same. Finally, the first electric telescopic rod 5 is controlled to retract. The first electric telescopic rod 5 then drives all the conductive post groups 3 at all positions to descend synchronously through the lifting linkage plate 6 and penetrate into the refrigeration box 2. Finally, each group of conductive post groups 3 touches the conductive output end of the corresponding battery pack 14 and is connected to electricity. In this way, each fan 11 distributed on the upper side plate 4 is powered on and runs, and the running fan 11 consumes the electrical energy of the corresponding battery pack 14 as a load.

[0043] After the fan 11 is started, the airflow generated blows onto the fan blade 19. The fan blade 19 is subjected to air pressure and slides close to the corresponding connecting vertical plate 20 by the guide rod 27. During this process, the first spring 26 is stretched to generate a rebound force.

[0044] When one of the battery packs 14 runs out of power first, the corresponding fan 11 stops, and the guide rod 27 slides back to its original position under the elastic force of the first spring 26. At this time, the first roller 25 passes through the mounting groove 22 and presses against the side of the rotating plate 23 where the pressure sensor switch 24 is installed, causing the pressure sensor switch 24 to be activated. The pressure sensor switch 24 then causes the corresponding second electric telescopic rod 12 to extend. Thus, the second electric telescopic rod 12 drives the corresponding locking block 17 to insert into the annular locking groove 10 at the highest position of the lifting column 9. After the second electric telescopic rod 12 drives the locking block 17 into the annular locking groove 10, the rotating plate 23 is deflected by the pressure of the first roller 25 and presses against the trigger button switch 21. Then, the trigger button switch 21 causes the stepper electric push rod 8 to extend, causing the lifting column 9 to rise a certain distance. Since the second electric telescopic rod 12 connected to the locking block 17 is slidably connected to the corresponding connecting guide rail 13, the locking block 17 that is locked in the annular locking groove 10 will rise accordingly. The locking blocks 17 in other positions will then align with the next annular locking groove 10 on the lifting column 9. When the next battery pack 14 runs out of power, the corresponding second electric telescopic rod 12 and the stepping electric push rod 8 will be triggered again, thereby driving another locking block 17 to rise. The locking blocks 17 that were originally connected to the lifting column 9 will rise synchronously and always remain in a high position. Finally, after all the battery packs 14 have run out of power, the height position of the locking block 17 corresponding to each battery pack 14 can be compared to determine which battery pack 14 has the longest battery life under the same low temperature conditions, thereby determining the battery pack 14 with the best performance.

[0045] Furthermore, when the fan 11 starts blowing air and causes the fan blades 19 to move laterally, the second roller 18 on the fan blades 19 presses against the timer start / stop button switch 16 once, causing the timer 15 to start timing. When the fan 11 stops, the fan blades 19 return to their original position, and the second roller 18 presses against the timer start / stop button switch 16 again, causing the timer 15 to stop timing. In this way, the tester can determine the battery pack 14's battery life in a low-temperature environment based on the duration displayed by the timer 15.

[0046] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A device for testing the cold resistance performance of an electric vehicle battery, comprising a support base (1), wherein a plurality of refrigeration chambers (2) are circumferentially distributed on the upper surface of the support base (1); characterized in that: The support base (1) is connected to an upper side plate (4). Multiple fans (11) corresponding to the refrigeration boxes (2) are arranged circumferentially on the upper side plate (4). Each fan (11) is equipped with a power cord (7). The support base (1) is equipped with a synchronous power connection component that connects to each power cord (7), and each refrigeration box (2) is connected to the synchronous power connection component. A connecting vertical plate (20) is provided on one side of the air outlet of each fan (11), and the connecting vertical plate (20) is fixedly connected to the upper side plate (4). Each connecting vertical plate (20) has a fan blade (19) on the side closest to the corresponding fan (11). A guide rod (27) is connected to the fan blade (19), and the guide rod (27) passes through the fan blade. The corresponding connecting vertical plate (20) is connected to the guide rod (27) and the connecting vertical plate (20) by a first spring (26). The upper side plate (4) has multiple sets of trigger switch groups distributed circumferentially, and each set of trigger switch groups is matched with the corresponding guide rod (27). The upper side plate (4) is connected to a stepper electric push rod (8) that is electrically connected to the trigger switch group. The telescopic end of the stepper electric push rod (8) is connected to a lifting column (9), and the lifting column (9) has multiple annular slots (10) distributed longitudinally. The top of each fan (11) is connected to a connecting guide rail (13), and each connecting guide rail (13) is slidably provided with an electric telescopic clip that matches the annular slot (10), and the electric telescopic clip is electrically connected to the trigger switch group. Each set of trigger switches includes a mounting slot (22), a pressure sensing switch (24), and a trigger button switch (21). The mounting slot (22) is opened on the upper side plate (4). A rotating plate (23) is vertically and movably connected to the inside of the mounting slot (22) via a spring-loaded hinge. The pressure sensing switch (24) is installed on the side of the rotating plate (23) away from the connecting vertical plate (20). The trigger button switch (21) is installed on the end of the mounting slot (22) near the connecting vertical plate (20). Each guide rod (27) is connected to a first roller (25) at the end away from the fan blade (19). Each trigger button switch (21) is electrically connected to a stepper electric push rod (8). The electric telescopic clamp includes a second electric telescopic rod (12) and a clamping block (17). The second electric telescopic rod (12) is slidably connected to the connecting guide rail (13). The clamping block (17) is disposed at the telescopic end of the second electric telescopic rod (12). The second electric telescopic rod (12) is electrically connected to the corresponding pressure sensing switch (24). An elastic buffer is disposed between the clamping block (17) and the corresponding telescopic end of the second electric telescopic rod (12). The elastic buffer includes a slide rod (30) and a second spring (29). The slide rod (30) is connected to the locking block (17). The telescopic end of the second electric telescopic rod (12) is provided with a sliding cavity (28). The slide rod (30) slides through the sliding cavity (28). The second spring (29) is connected between the slide rod (30) and the sliding cavity (28).

2. The electric vehicle battery cold resistance testing device according to claim 1, characterized in that, The synchronous power connection assembly includes a first electric telescopic rod (5) and a conductive column group (3). The first electric telescopic rod (5) is connected to the support base (1). The telescopic end of the first electric telescopic rod (5) is connected to a lifting linkage plate (6). The conductive column group (3) is provided in multiple groups and is distributed circumferentially on the lifting linkage plate (6). Each group of conductive column groups (3) penetrates the top of the corresponding refrigeration box (2). Each group of conductive column groups (3) is also electrically connected to the corresponding power line (7).

3. The electric vehicle battery cold resistance testing device according to claim 1, characterized in that, Each of the aforementioned fans (11) is also provided with a timing device that cooperates with the corresponding fan blades (19).

4. The electric vehicle battery cold resistance testing device according to claim 3, characterized in that, The timing device includes a timer (15) and a second roller (18). The timer (15) is connected to the upper side of the fan (11) housing. A timing start / stop button switch (16) is provided at the bottom of the timer (15). The second roller (18) is connected to the top of the fan blade (19) and cooperates with the timing start / stop button switch (16).

5. The electric vehicle battery cold resistance testing device according to claim 1, characterized in that, The inner bottom of the refrigeration box (2) is connected to a U-shaped limiting frame (31).

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