Impact testing equipment for lithium batteries

Abstract

This utility model relates to the field of lithium battery impact testing technology, specifically to an impact testing device for lithium batteries, including a test chamber. The test chamber contains a fixing fixture and an impact device. The fixing fixture is used to fix both ends of the lithium battery. The impact device is arranged on both sides of the fixing fixture. The impact device includes a test block and an inflation mechanism. A chamber is formed within the test block, and an impact rod is slidably disposed within the chamber. One end of the impact rod is elastically connected to the test block. The inflation mechanism is used to fill the chamber with high-pressure gas, causing the other end of the impact rod to impact the lithium battery. This utility model can perform simultaneous impact testing on both sides of a lithium battery.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery impact testing technology, and specifically to an impact testing device for lithium batteries. Background Technology

[0002] Impact testing is one of the many safety tests for lithium batteries used in electric vehicles. After a high-speed impact, the lithium battery must be able to maintain normal power supply and not experience thermal runaway.

[0003] Chinese utility model patent CN217878266U discloses a lithium battery impact testing device. This device places the lithium battery on a tray and uses impact blocks to strike the battery, thus achieving impact testing. However, this device can only simulate a single-sided impact on the lithium battery. It cannot simulate simultaneous impacts on both sides of the battery, such as when a vehicle is simultaneously impacted from the front and rear (e.g., a rear-end collision plus being crushed by an obstacle in front), which could result in active impacts on both sides of the battery pack. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an impact testing device for lithium batteries, capable of simultaneously impacting lithium batteries from both sides.

[0005] To address the aforementioned technical problems, this utility model provides an impact testing device for lithium batteries, comprising a test chamber. The test chamber contains a fixing fixture and an impact device. The fixing fixture is used to fix both ends of the lithium battery. The impact device is arranged on both sides of the fixing fixture. The impact device includes a test block and an inflation mechanism. A chamber is formed within the test block, and an impact rod is slidably disposed within the chamber. One end of the impact rod is elastically connected to the test block. The inflation mechanism is used to inject high-pressure gas into the chamber, causing the other end of the impact rod to impact the lithium battery.

[0006] In some embodiments, a pressure relief pump is provided at the bottom of the test block, the air inlet of the pressure relief pump is connected to the chamber, and the air outlet of the pressure relief pump is arranged inside the test chamber.

[0007] In some embodiments, the inflation mechanism is connected to the chamber via an air outlet pipe, an electromagnetic valve is provided on the air outlet pipe, and a controller is provided on the test box. The controller is used to control the opening and closing of the electromagnetic valve and the pressure relief pump.

[0008] In some embodiments, a drive mechanism is provided on the test box, and an adjusting screw is connected to the output end of the drive mechanism. The adjusting screw is arranged vertically, and the end of the adjusting screw away from the drive mechanism is rotatably connected to the test box. The test block is threadedly connected to the adjusting screw, so that the test block can move along the adjusting screw.

[0009] In some embodiments, the fixing fixture includes a lower support plate, two connecting plates are fixedly disposed on the lower support plate, and an upper pressure plate is elastically connected to one end of the connecting plate away from the lower support plate. The lower support plate and the upper pressure plate are used to fix the lithium battery between them.

[0010] In some embodiments, a telescopic plate is slidably disposed within the connecting plate, one end of the telescopic plate is elastically connected to the connecting plate, and the other end of the telescopic plate is fixedly connected to the upper pressure plate.

[0011] In some embodiments, limiting grooves are formed on the opposing surfaces of the lower support plate and the upper pressure plate, and the limiting grooves are used to define the lithium battery.

[0012] In some embodiments, a slide rail is provided at the bottom of the test chamber, the bottom of the fixing fixture is slidably disposed on the slide rail, and an electromagnet is disposed on the slide rail for fixing the fixing fixture.

[0013] In some embodiments, a slide table is slidably disposed on the slide rail, a slide seat is mounted on the slide table, and the fixing fixture and electromagnet are both arranged on the slide seat.

[0014] In some embodiments, a transparent door is provided on one side of the test chamber.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. After the lithium battery is fixed by the fixing fixture, the inflation mechanism can simultaneously inflate the test blocks on both sides of the fixing fixture, so that the two impact rods impact both sides of the lithium battery at the same time, thereby realizing the simultaneous active impact test on both sides of the lithium battery.

[0017] 2. By setting up a pressure relief pump, this utility model can discharge the high-pressure gas in the test block into the test chamber. The high-pressure gas can be an inert gas, which can extinguish the flame generated by the lithium battery due to impact, thus improving the safety of the test equipment.

[0018] 3. This utility model, by setting an adjusting screw, allows the height of the test block to be adjusted, enabling the impact rod to impact different positions of the lithium battery, thus conducting more diverse impact tests.

[0019] 4. This utility model uses a lower support plate and an upper support plate to clamp and fix the lithium battery, which facilitates the installation and removal of the lithium battery.

[0020] 5. The lower and upper support plates of this utility model have limiting grooves to prevent the lithium battery from shifting after being impacted. Attached Figure Description

[0021] Figure 1 This is an isometric view of the present invention;

[0022] Figure 2 This is a cross-sectional view of the present invention;

[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 for Figure 2 Enlarged view at point B in the middle;

[0025] Figure 5 This is an exploded view of the fixing fixture of this utility model.

[0026] Reference numerals: 1-Test chamber; 2-Transparent door; 3-Sliding seat; 4-Slide rail; 5-Slide table; 6-Lower support plate; 7-Electromagnet; 8-Connecting plate; 9-Telescopic plate; 10-Compression spring; 11-Upper pressure plate; 12-Adjusting screw; 13-Sliding nut; 14-Test block; 15-Piston plate; 16-Impact rod; 17-Reset spring; 18-Outlet pipe; 19-High-pressure carbon dioxide tank; 20-Solenoid valve; 21-Pressure relief pump; 22-Servo motor; 23-Power plug; 24-Controller. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0028] like Figure 2 As shown, this utility model provides an impact testing device for lithium batteries, including a test chamber 1. A fixing fixture and an impact device are installed inside the test chamber 1. The fixing fixture is located in the middle of the test chamber 1 and is used to fix the upper and lower ends of the lithium battery. The impact device is arranged on both sides of the fixing fixture. Figure 3 As shown, the impact device includes a test block 14 and an inflation mechanism. A chamber is formed within the test block 14, and an impact rod 16 is slidably disposed within the chamber. One end of the impact rod 16 is connected to a piston plate 15. The piston plate 15 and the test block 14 are elastically connected by a return spring 17. Figure 1 As shown, the inflation mechanism is installed on the top of the test chamber 1. The inflation mechanism is used to fill the chamber with high-pressure gas, so that the other end of the impact rod 16 impacts the lithium battery. The inflation mechanism can be a high-pressure carbon dioxide gas tank 19.

[0029] It is understandable that two impact devices can actively impact the two opposite sides of the lithium battery, and the impact time can be simultaneous or with a time difference, which can be achieved by directly controlling the inflation time of the two inflation mechanisms.

[0030] In some embodiments, such as Figure 3 As shown, a pressure relief pump 21 is installed at the bottom of the test block 14. The air inlet of the pressure relief pump 21 is connected to the chamber, and the air outlet of the pressure relief pump 21 is arranged inside the test box 1, with the air outlet of the pressure relief pump 21 facing the fixed fixture.

[0031] Understandably, after the impact test is completed, the pressure relief pump 21 can be turned on to directly discharge the carbon dioxide gas in the test block 14 into the test chamber 1. If the lithium battery catches fire due to the impact, the carbon dioxide gas can be used to extinguish the fire directly, thus improving the safety of the test device.

[0032] In some embodiments, such as Figure 3 As shown, the inflation mechanism is connected to the chamber through the air outlet pipe 18. A solenoid valve 20 is installed on the air outlet pipe 18, and a controller 24 is installed on the test box 1. The controller 24 is used to control the opening and closing of the solenoid valve 20 and the pressure relief pump 21.

[0033] In some embodiments, such as Figure 2 As shown, a drive mechanism is installed on the test chamber 1. The drive mechanism can be a servo motor 22. An adjusting screw 12 is connected to the output end of the drive mechanism. The adjusting screw 12 is arranged vertically, and the end of the adjusting screw 12 away from the drive mechanism is rotatably connected to the test chamber 1. Figure 3 As shown, multiple sliding nuts 13 are provided on the adjusting screw 12, and the test block 14 is fixed on the sliding nuts 13. The test block 14 is threadedly connected to the adjusting screw 12 through the sliding nuts 13, so that the test block 14 can move along the adjusting screw 12.

[0034] Understandably, by controlling the rotation of the adjusting screw 12 through the drive mechanism, and since the sliding nut 13 is threadedly connected to the adjusting screw 12, the sliding nut 13 can move vertically on the adjusting screw 12, thereby driving the test block 14 to move vertically, thus achieving impact testing on different parts of the lithium battery. To avoid interference between the test block 14 and the vent pipe 18 of the inflation mechanism, the vent pipe 18 connecting the inflation mechanism and the test block 14 is a flexible hose, ensuring that the test block 14 can move up and down and that high-pressure gas can smoothly enter the test block 14.

[0035] In some embodiments, such as Figure 5 As shown, the fixture includes a lower support plate 6, on which two connecting plates 8 are fixedly mounted. An upper pressure plate 11 is elastically connected to one end of the connecting plate 8 away from the lower support plate 6. The lower support plate 6 and the upper pressure plate 11 are used to fix the lithium battery between them.

[0036] Understandably, by pulling apart the lower support plate 6 and the upper pressure plate 11, the lithium battery is placed between the lower support plate 6 and the upper pressure plate 11, and then the lower support plate 6 and the upper pressure plate 11 are released to fix the lithium battery.

[0037] In some embodiments, such as Figure 5 As shown, a telescopic plate 9 is slidably arranged inside the connecting plate 8. One end of the telescopic plate 9 is elastically connected to the connecting plate 8, and the other end of the telescopic plate 9 is fixedly connected to the upper pressure plate 11.

[0038] In some embodiments, limiting grooves are formed on the opposing surfaces of the lower support plate 6 and the upper pressure plate 11, and the limiting grooves are used to define the lithium battery. The size and shape of the limiting grooves are designed according to the size and shape of the lithium battery, so that both ends of the lithium battery can be inserted into the limiting grooves without wobbling.

[0039] Understandably, the lower support plate 6 and the upper pressure plate 11 can apply compressive force to both ends of the lithium battery. The limiting groove can prevent the lithium battery from moving in the direction perpendicular to the compressive force, thereby completely fixing the lithium battery and preventing the lithium battery from shifting during the impact test.

[0040] In some embodiments, such as Figure 4 As shown, a slide rail 4 is provided at the bottom of the test chamber 1. Two slide rails 4 are arranged in parallel. The bottom of the fixture is slidably mounted on the slide rail 4. An electromagnet 7 is installed on the slide rail 4 to fix the fixture. Fixing the fixture by means of the electromagnet 7 is simple and convenient, reducing the total workload of the testing personnel. The slide rail 4 can be an electric slide rail 4.

[0041] In some embodiments, such as Figure 4 As shown, a slide table 5 is slidably mounted on the slide rail 4, and a slide seat 3 is installed on the slide table 5. A fixing groove is opened on the slide seat 3, and electromagnets 7 are set on both sides of the fixing groove. An insert plate is set at the bottom of the fixing fixture, and the insert plate is inserted into the fixing groove and fits against the electromagnets 7.

[0042] In some embodiments, a transparent door 2 is provided on one side of the test chamber 1.

[0043] The back of the test box 1 is connected to a power plug 23. The slide rail 4, electromagnet 7, solenoid valve 20, pressure relief pump 21, servo motor 22, and the power plug 23 are all electrically connected to the controller 24.

[0044] The method of using this impact testing equipment for lithium batteries is as follows:

[0045] Open the transparent box door 2, the controller 24 turns off the electromagnet 7, the electromagnet 7 no longer attracts the lower support plate 6, pull the lower support plate 6, and remove the fixture from the test box 1;

[0046] Pull the lower support plate 6 and the upper pressure plate 11 apart, so that the lower support plate 6 and the upper pressure plate 11 are far apart. Place the lithium battery to be tested between the lower support plate 6 and the upper pressure plate 11. Release the upper pressure plate 11. The compression spring 10 drives the upper pressure plate 11 to move in the opposite direction through the telescopic plate 9. The upper pressure plate 11 will press down on the lithium battery, thus completing the fixation of the lithium battery. Put the fixing fixture back into the test box 1. The controller 24 starts the electromagnet 7. The electromagnet 7 attracts the lower support plate 6 and fixes the lower support plate 6 on the sliding seat 3.

[0047] When the transparent door 2 is closed, the controller 24 starts the electric slide rail 4 and the servo motor 22. The electric slide rail 4 drives the sliding seat 3 and the fixed fixture to move towards the center of the test box 1 via the slide table 5. At the same time, the servo motor 22 drives the adjusting screw 12 to rotate. The rotating adjusting screw 12 drives the sliding nut 13 to move. The sliding nut 13 drives the impact rod 16 to rise or fall via the test block 14. When the impact rod 16 is aligned with the impact test point of the lithium battery, the controller 24 shuts off the electric slide rail 4 and the servo motor 22. The lithium battery and the impact rod 16 no longer move. The moving position of the fixed fixture and the lifting height of the test block 14 can be preset or manually controlled.

[0048] The controller 24 opens the solenoid valve 20, and the high-pressure carbon dioxide in the high-pressure carbon dioxide tank 19 flows rapidly into the chamber of the test block 14. The high-pressure carbon dioxide entering the chamber will expand, and the expanding high-pressure carbon dioxide will push the piston plate 15 and the impact rod 16 to move outward. The outward-moving impact rod 16 will impact the lithium battery. The impact rods 16 on both sides can impact both sides of the lithium battery at the same time.

[0049] After the impact is completed, the controller 24 starts the pressure relief pump 21, which extracts the carbon dioxide from the test block 14, and the air pressure inside the test block 14 returns to normal. The reset spring 17 drives the piston plate 15 and the impact rod 16 to move in opposite directions, and the impact rod 16 returns to the test block 14. At the same time, the carbon dioxide extracted by the pressure relief pump 21 can extinguish the flame generated by the impact on the lithium battery.

[0050] After the test is completed, open the transparent box door 2. The electric slide rail 4 drives the sliding seat 3 and the fixed fixture to move close to the transparent box door 2 via the slide table 5. The controller 24 turns off the electromagnet 7, and the electromagnet 7 no longer attracts the lower support plate 6, so the lithium battery is removed from the fixed fixture.

[0051] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An impact testing device for lithium batteries, characterized in that: The test box (1) is provided with a fixing fixture and an impact device. The fixing fixture is used to fix the two ends of the lithium battery. The impact device is arranged on both sides of the fixing fixture. The impact device includes a test block (14) and an inflation mechanism. A chamber is opened in the test block (14). An impact rod (16) is slidably arranged in the chamber. One end of the impact rod (16) is elastically connected to the test block (14). The inflation mechanism is used to fill the chamber with high-pressure gas so that the other end of the impact rod (16) impacts the lithium battery.

2. The impact testing equipment for lithium batteries according to claim 1, characterized in that: A pressure relief pump (21) is provided at the bottom of the test block (14). The air inlet of the pressure relief pump (21) is connected to the chamber, and the air outlet of the pressure relief pump (21) is arranged inside the test box (1).

3. The impact testing equipment for lithium batteries according to claim 2, characterized in that: The inflation mechanism is connected to the chamber through an air outlet pipe (18). An electromagnetic valve (20) is installed on the air outlet pipe (18), and a controller (24) is installed on the test box (1). The controller (24) is used to control the opening and closing of the electromagnetic valve (20) and the pressure relief pump (21).

4. The impact testing equipment for lithium batteries according to claim 1, characterized in that: The test box (1) is provided with a drive mechanism. The output end of the drive mechanism is connected to an adjusting screw (12). The adjusting screw (12) is arranged vertically. The end of the adjusting screw (12) away from the drive mechanism is rotatably connected to the test box (1). The test block (14) is threadedly connected to the adjusting screw (12), so that the test block (14) can move along the adjusting screw (12).

5. The impact testing apparatus for lithium batteries according to any one of claims 1 to 4, characterized in that: The fixing fixture includes a lower support plate (6), on which two connecting plates (8) are fixedly installed. An upper pressure plate (11) is elastically connected to one end of the connecting plate (8) away from the lower support plate (6). The lower support plate (6) and the upper pressure plate (11) are used to fix the lithium battery between them.

6. The impact testing equipment for lithium batteries according to claim 5, characterized in that: A telescopic plate (9) is slidably disposed inside the connecting plate (8). One end of the telescopic plate (9) is elastically connected to the connecting plate (8), and the other end of the telescopic plate (9) is fixedly connected to the upper pressure plate (11).

7. The impact testing equipment for lithium batteries according to claim 5, characterized in that: Limiting grooves are provided on the opposing surfaces of the lower support plate (6) and the upper pressure plate (11), and the limiting grooves are used to limit the lithium battery.

8. The impact testing apparatus for lithium batteries according to any one of claims 1 to 4, characterized in that: The bottom of the test box (1) has a slide rail (4), the bottom of the fixture is slidably mounted on the slide rail (4), and an electromagnet (7) is mounted on the slide rail (4) to fix the fixture.

9. The impact testing equipment for lithium batteries according to claim 8, characterized in that: A slide table (5) is slidably arranged on the slide rail (4), and a slide seat (3) is installed on the slide table (5). The fixing fixture and the electromagnet (7) are both arranged on the slide seat (3).

10. The impact testing apparatus for lithium batteries according to any one of claims 1 to 4, characterized in that: A transparent door (2) is provided on one side of the test box (1).

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