A safety performance testing device for lithium batteries

Abstract

The present invention relates to the technical field of battery safety detection. The present application discloses a safety performance test device for lithium batteries, including a connecting rod, a slide rail is provided on the back of the outer surface of the connecting rod through integral casting, the slide rail is connected to a limit seat by sliding fit, the back of the slide rail is matched with an adjustment gear I by gear meshing, an adjustment motor II is fixedly installed by bolt connection at a position near the top of the back of the outer surface of the connecting rod, and an adjustment gear II is fixedly installed at one end of the output shaft of the adjustment motor II by bolt connection. The adjustment gear II is connected to an arc-shaped rack by gear meshing, so that the overall inclination angle of the adjustment device can be adjusted, thereby changing the incident angle when the intrusion device contacts the top of the lithium battery during the experiment, so that the bottom of the intrusion device can penetrate the top of the lithium battery at a certain inclination angle, thereby better simulating the state of the battery after being hit by projectiles from various directions in actual situations.

Description

Technical Field

[0001] The present application relates to the technical field of battery safety testing, and in particular to a safety performance testing device for lithium batteries. Background Art

[0002] With the development of new energy, more and more cars are choosing battery-driven technology for development. At present, new energy vehicles are mainly divided into two categories, one is pure electric models, and the other is extended-range hybrid models. Both are popular in the consumer market. Among them, most of the batteries used in new energy vehicles are lithium iron phosphate batteries or ternary lithium batteries. Since the charged lithium battery stores a large amount of energy, in order to avoid safety accidents, the stability of the lithium battery will be tested to find out whether the lithium battery will naturally explode under some extreme conditions.

[0003] Traditional lithium battery safety performance testing devices use a needle puncture method, usually consisting of a bracket for mounting the lithium battery, a needle puncture device, and a telescopic device for driving the needle puncture device. During use, the lithium battery to be tested will be mounted on the bracket, and the telescopic device will drive the needle puncture device closer to the lithium battery. During this process, the needle pierces the outer skin of the lithium battery and contacts the battery cell inside it, forming a short circuit to test the safety performance of the battery under this condition. This type of lithium battery safety performance testing device has the advantages of simple structure, easy use and low cost, and is currently the most widely used one.

[0004] Although the existing safety performance testing devices for lithium batteries have many of the above-mentioned advantages, they still have certain limitations in actual use. The puncture needle in traditional equipment can only penetrate the lithium battery in a vertical direction, but cannot penetrate the lithium battery from other angles. In addition, the puncture needle used in traditional equipment is relatively slender. After piercing the battery, the puncture needle can isolate the air after contacting the outer skin of the lithium battery, which makes it difficult for the outside air to contact the internal battery cell. This is different from the actual situation where the lithium battery is broken and exposed after being hit by debris, resulting in the test results being unable to fit the actual situation. In this regard, the present application document proposes a safety performance testing device for lithium batteries, aiming to solve the above-mentioned problems. Summary of the invention

[0005] The present application proposes a safety performance testing device for lithium batteries, which is capable of performing intrusion experiments on lithium batteries from various angles, so as to solve the problem that traditional equipment can only be intruded from the vertical direction.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a safety performance testing device for lithium batteries, comprising a back plate, a connecting plate is fixedly installed by welding at the bottom of the front side of the back plate near the left and right sides, a spring rod is movably installed on one side of the connecting plate through telescopic cooperation, a clamp is fixedly installed on one end of the spring rod through welding, a lithium battery is fixedly installed on one side of the clamp by snap connection, a support frame is fixedly installed by welding at the bottom of the connecting plate, a connecting hole is drilled by a drilling machine at a position near the bottom of the middle of the front side of the back plate, a rotating device is movably sleeved inside the connecting hole through a bearing connection, an adjusting device is movably installed at one end of the rotating device through sliding cooperation, a mounting plate is fixedly installed by welding at a position above the connecting hole on the front side of the back plate, an arc-shaped rack is fixedly installed on the front side of the mounting plate through bolt connection, and an air compressor is fixedly installed on the top of the mounting plate through bolt connection.

[0007] Furthermore, the rotating device includes a rotating seat, which is movably connected to the connecting hole by a bearing connection, a horizontal plate is fixedly installed on one side of the rotating seat by welding, a limit seat is fixedly installed on one end of the horizontal plate by welding, an adjustment device is movably installed on one side of the limit seat by sliding cooperation, a rib plate is fixedly installed on the top of the horizontal plate near both sides by welding, an adjusting gear I is movably sleeved on the inner side of the rib plate near the top through an axial hole, an adjusting motor I is fixedly installed on the outer side of the rib plate at a position corresponding to the adjusting gear I by bolt connection, and the output shaft of the adjusting motor I is fixedly connected to the adjusting gear I by bolt connection.

[0008] Furthermore, the adjusting device includes a connecting rod, the output end of the air compressor is connected to the outer surface of the connecting rod near the top through a pipeline, the back side of the outer surface of the connecting rod is provided with a slide rail through integral casting, the slide rail is connected to the limit seat by sliding fit, the back side of the slide rail is matched with the adjusting gear I by gear tooth meshing, an adjusting motor II is fixedly installed on the back side of the outer surface of the connecting rod near the top by bolt connection, one end of the output shaft of the adjusting motor II is fixedly installed with an adjusting gear II by bolt connection, the adjusting gear II is connected to the arc rack by gear tooth meshing, a travel hole is drilled at the bottom of the connecting rod, a rubber sleeve is provided on the inner wall of the travel hole near the top, a sleeve hole is drilled at the top of the connecting rod, the sleeve hole is connected to the travel hole, an intrusion device is movably installed inside the sleeve hole by telescopic fit, and a trigger device is fixedly installed on the front side of the outer surface of the connecting rod by welding.

[0009] The lockhole that is formed on the upper part of the body is formed on the upper part of the body, and the lockhole that is formed on the lower part of the body is formed on the bottom of the body, and the lockhole that is formed on the lower part of the body is formed on the bottom of the body.

[0010] Furthermore, the connecting rod and the sleeve hole are movably sleeved, and a gap is left between the rubber sleeve and the intrusion rod.

[0011] Further, the trigger device includes a spring shaft seat and a sliding seat, the spring shaft seat is installed on the outer surface of the connecting rod near the top by welding, the top of the spring shaft seat is provided with a trigger plate through the shaft hole and the movable sleeve, the front of the trigger plate is provided with an inclined surface near the bottom, one end of the top of the trigger plate is fixedly installed with a tooth block by welding, the tooth block is clamped with the ratchet bar through a ratchet structure, the top of the sliding seat is movably installed with a travel rod by sliding cooperation, the bottom of the sliding seat is fixedly installed with a reset spring by clamping, one end of the bottom of the reset spring is connected to the travel rod by clamping, and the top of the travel rod is provided with an adjusting rod through a threaded connection sleeve.

[0012] This application has the following beneficial effects.

[0013] 1. It can change the incident angle when the intrusion device contacts the top of the lithium battery during the experiment, so that the bottom of the intrusion rod can penetrate the top of the lithium battery at a certain angle, thereby better simulating the state of the battery after being hit by projectiles from various directions in actual situations.

[0014] 2. The speed at which the intrusion device needs to penetrate the top surface of the lithium battery at different angles, the relationship between the depth of the intrusion device penetrating the lithium battery at different angles and the kinetic energy of the intrusion device, and the speed at which the intrusion device needs to penetrate the lithium battery at different angles can be obtained, thereby obtaining more experimental data.

[0015] 3. It can better simulate that high-speed moving debris will deform first after contacting with the lithium battery, so that the contact area between the debris and the battery increases, the breach formed by the invasion is more obvious, the exposed area of ​​the breach formed by the invasion is larger, and more air will come into contact with the exposed battery cells in the breach, thereby obtaining the safety performance of the lithium battery under such extreme conditions.

[0016] 4. The top of the rubber sleeve can be deformed under the action of high-pressure gas, so that its inner wall can fit the outer surface of the intrusion rod to prevent the leakage of high-pressure gas. When the intrusion device is released, due to the small distance between the guide hole and the rubber sleeve, the leakage of the gas inside the intrusion rod through the guide hole is blocked, avoiding the rapid decrease of the gas pressure inside the intrusion rod, resulting in the reset of the upper penetration plate and the lower penetration plate, resulting in a reduction in the invasion effect.

[0017] 5. The release of the intrusion device does not require human intervention, which improves the automation of the device. In addition, the distance between the intrusion device and the lithium battery can be adjusted as needed when released, making the experimental data obtained more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute a part of the specification, illustrate embodiments disclosed in the present application and, together with the description, serve to explain the principles disclosed in the present application.

[0019] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a front view of the structure of the present invention;

[0022] Figure 3 The structure of the present invention Figure 2 Sectional view in the A direction;

[0023] Figure 4 It is a schematic diagram of the structural rotating device of the present invention;

[0024] Figure 5 It is a schematic diagram of the structural adjustment device of the present invention;

[0025] Figure 6 It is a front view of the structural adjustment device of the present invention;

[0026] Figure 7 The structure of the present invention Figure 6 Cross-section along the middle B direction;

[0027] Figure 8 It is a schematic diagram of the structural intrusion device of the present invention;

[0028] Fig. 9 It is a front view of the structural intrusion device of the present invention;

[0029] Fig.10 The structure of the present invention Fig. 9 Cross-sectional view along the middle C direction.

[0030] In the figure; 1, back plate; 2, connecting plate; 3, spring rod; 4, clamping plate; 5, lithium battery; 6, support frame; 7, connecting hole; 8, rotating device; 81, rotating seat; 82, cross plate; 83, limit seat; 84, rib plate; 85, adjusting gear I; 86, adjusting motor I; 9, adjusting device; 91, connecting rod; 92, slide rail; 93, adjusting motor II; 94, adjusting gear II; 95, travel hole; 96, rubber sleeve; 97, sleeve hole; 98, intrusion device; 9 81. Intrusion rod; 982. Side hole; 983. Travel block; 984. Upper penetration plate; 985. Lower penetration plate; 986. Travel spring; 987. Diversion hole; 988. Connecting rod; 989. Ratchet bar; 99. Trigger device; 991. Spring shaft seat; 992. Sliding seat; 993. Trigger plate; 994. Tooth block; 995. Travel rod; 996. Return spring; 997. Adjustment rod; 10. Mounting plate; 11. Arc rack; 12. Air compressor. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] A safety performance test device for lithium batteries, see Figure 1-Figure 3, including a back plate 1, a connecting plate 2 is fixedly installed by welding at the bottom of the front side of the back plate 1 near the left and right sides, a spring rod 3 is movably installed on one side of the connecting plate 2 through telescopic cooperation, a clamping plate 4 is fixedly installed on one end of the spring rod 3 through welding, a lithium battery 5 is fixedly installed on one side of the clamping plate 4 through card connection, a support frame 6 is fixedly installed by welding at the bottom of the connecting plate 2, a connecting hole 7 is drilled by a drilling machine at a position near the bottom of the middle of the front side of the back plate 1, a rotating device 8 is movably sleeved in the interior of the connecting hole 7 through a bearing connection, an adjusting device 9 is movably installed at one end of the rotating device 8 through sliding cooperation, and a rotating device 8 is movably sleeved in the interior of the connecting hole 7 through a bearing connection, so that the adjusting device 9 as a whole can rotate with the axis of the connecting hole 7 as the rotation center, a mounting plate 10 is fixedly installed by welding at a position above the connecting hole 7 on the front side of the back plate 1, an arc rack 11 is fixedly installed on the front side of the mounting plate 10 through bolt connection, and an air compressor 12 is fixedly installed on the top of the mounting plate 10 through bolt connection.

[0033] See also Figure 3-Figure 4 The rotating device 8 includes a rotating seat 81, which is movably connected to the connecting hole 7 by a bearing connection. A horizontal plate 82 is fixedly installed on one side of the rotating seat 81 by welding, and a limit seat 83 is fixedly installed on one end of the horizontal plate 82 by welding. An adjusting device 9 is movably installed on one side of the limit seat 83 by sliding cooperation. A rib plate 84 is fixedly installed on the top of the horizontal plate 82 near both sides by welding, and an adjusting gear I85 is movably sleeved on the inner side of the rib plate 84 near the top through an axial hole cooperation. An adjusting motor I86 is fixedly installed on the outer side of the rib plate 84 at a position corresponding to the adjusting gear I85 by bolt connection, and the output shaft of the adjusting motor I86 is fixedly connected to the adjusting gear I85 by bolt connection.

[0034] See also Figure 4-Figure 7The adjusting device 9 includes a connecting rod 91, the output end of the air compressor 12 is connected to the outer surface of the connecting rod 91 near the top through a pipeline, the back of the outer surface of the connecting rod 91 is provided with a slide rail 92 through integral casting, the slide rail 92 is connected to the limit seat 83 by sliding fit, the back of the slide rail 92 is matched with the adjusting gear I 85 by gear meshing, an adjusting motor II 93 is fixedly installed on the back of the outer surface of the connecting rod 91 near the top by bolt connection, an adjusting gear II 94 is fixedly installed on one end of the output shaft of the adjusting motor II 93 by bolt connection, and the adjusting gear II 94 is connected to the arc rack 11 by gear meshing, a travel hole 95 is drilled at the bottom of the connecting rod 91 by a drilling machine, a rubber sleeve 96 is provided on the inner wall of the travel hole 95 near the top, a sleeve hole 97 is drilled at the top of the connecting rod 91 by a drilling machine, the sleeve hole 97 is connected to the travel hole 95, and the inner part of the sleeve hole 97 is connected to the travel hole 95. An intrusion device 98 is movably installed in a telescopic manner, and a trigger device 99 is fixedly installed on the front side of the outer surface of the connecting rod 91 by welding. When the adjusting motor Ⅱ 93 drives the adjusting gear Ⅱ 94 to rotate, since the adjusting gear Ⅱ 94 is connected to the arc rack 11 through gear tooth meshing, the overall inclination angle of the adjusting device 9 can be adjusted, thereby changing the incident angle when the intrusion device 98 contacts the top of the lithium battery 5 during the experiment, and achieving that the bottom of the intrusion device 98 can penetrate the top of the lithium battery 5 at a certain inclination angle, thereby better simulating the state of the battery after being hit by projectiles from various directions in actual conditions. Traditional equipment can only simulate the process of vertical intrusion of the lithium battery from the top, and it is difficult to fit the damage of the lithium battery in the display state. The device involved in the present application document avoids this problem well, improves the simulation degree of the device experiment, and the experimental results can better fit the actual situation.

[0035] During the experimental preparation stage, high-pressure gas is injected into the interior of the connecting rod 91 by means of pressurization by the air compressor 12. As the pressure in the inner cavity of the connecting rod 91 increases, the force acting on the intrusion device 98 also increases continuously. The greater the kinetic energy of the intrusion device 98 after it is out of the clamped state, and the penetration effect is achieved through its own kinetic energy. During the experiment, not only the safety performance of the lithium battery after being penetrated can be obtained, but also the speed required for the intrusion device 98 to penetrate the top surface of the lithium battery 5 at different angles can be obtained, the relationship between the depth of penetration of the intrusion device 98 into the lithium battery 5 at different angles and the kinetic energy of the intrusion device 98, and the speed required for the intrusion device 98 to penetrate the lithium battery 5 at different angles can be obtained, so as to obtain more experimental data. The intrusion device of traditional equipment is fixedly connected to the telescopic device, and the lithium battery is invaded by uniform downward pressure, so that less experimental data can be obtained. Compared with traditional equipment, the device involved in this application document has better experimental properties, which improves the practicality of the device.

[0036] See also Figure 7-Figure 10 The intrusion device 98 includes an intrusion rod 981, the bottom of the intrusion rod 981 is set as a pointed head, and side holes 982 are drilled on both sides of the outer surface of the intrusion rod 981 by drilling a hole on a drilling machine. A travel block 983 is installed inside the intrusion rod 981 through a sliding fit. An upper penetration plate 984 is movably sleeved at a position near the bottom of the outer surface of the travel block 983 on both sides through an axial hole fit. A lower penetration plate 985 is movably sleeved at a position below the side hole 982 on both sides of the outer surface of the intrusion rod 981 through an axial hole fit. The bottom of the upper penetration plate 984 is connected to the top of the lower penetration plate 985 through an axial hole fit. The inner wall of the intrusion rod 981 is located at the travel block 98 3 is fixedly installed with a travel spring 986 by snapping, and one end of the bottom of the travel spring 986 is connected to the top of the travel block 983 by snapping, and guide holes 987 are drilled on both sides of the outer surface of the intrusion rod 981 near the bottom by drilling, and a connecting rod 988 is fixedly installed on the top of the intrusion rod 981 by welding, and a ratchet bar 989 is fixedly installed on the top of the connecting rod 988 by welding, and the ratchet bar 989 is connected to the trigger device 99 by snapping, when the air compressor 12 injects high-pressure gas into the interior of the connecting rod 91, the high-pressure gas will enter the interior of the intrusion rod 981 through the guide hole 987, so that the intrusion The internal gas pressure of the penetration rod 981 increases synchronously, and the pressure acts on the top of the travel block 983, so that the travel block 983 is displaced. Since the bottom end of the travel spring 986 is connected to the top of the travel block 983 by snapping, the higher the gas pressure inside the penetration rod 981, the greater the displacement distance of the travel block 983, so that the angle between the upper penetration plate 984 and the lower penetration plate 985 is reduced, and the degree of lateral expansion is greater, thereby increasing the invasion area of ​​the invasion rod 981, so that the bottom of the invasion rod 981 After contacting and invading the top of the lithium battery 5, the wound formed is larger, so that it can better simulate high-speed movement. After contacting the lithium battery 5, the fragments will first deform, which increases the contact area between the fragments and 15, and the breach formed by the invasion is more obvious. The exposed area of ​​the breach formed by the invasion is larger, and more air will come into contact with the exposed battery cells in the breach, thereby obtaining the safety performance of the lithium battery under such extreme conditions. However, the intrusion device in the traditional equipment has a fixed shape, and the lithium battery surface and the intrusion device can still form a sealed environment after the invasion, and the internal battery cells cannot be exposed to the air, resulting in deviations in the safety data finally obtained. The device involved in the present application document avoids this problem very well, and further improves the practicality of the device.

[0037] See also Figure 7-Figure 10, the connecting rod 988 and the sleeve hole 97 are movably sleeved, a gap is left between the rubber sleeve 96 and the intrusion rod 981, a rubber sleeve 96 is arranged on the inner wall of the travel hole 95 near the top, and a gap is left between the rubber sleeve 96 and the intrusion rod 981, so that after the high-pressure gas enters the interior of the connecting rod 91, the top of the rubber sleeve 96 is deformed under the action of the high-pressure gas, so that its inner wall can fit the outer surface of the intrusion rod 981 to prevent the high-pressure gas from leaking out, and when the intrusion device 98 is released, when the guide hole 987 moves to the rubber sleeve 96, due to the small distance between the two, the gas inside the intrusion rod 981 is blocked from leaking out through the guide hole 987, avoiding the rapid reduction of the air pressure inside the intrusion rod 981, resulting in the reset of the upper penetration plate 984 and the lower penetration plate 985, resulting in the problem of reduced invasion effect, thereby improving the stability of the device during operation.

[0038] See also Figure 4 and Figure 7 The trigger device 99 includes a spring shaft seat 991 and a sliding seat 992. The spring shaft seat 991 is installed on the outer surface of the connecting rod 91 near the top by welding. The top of the spring shaft seat 991 is provided with a trigger plate 993 through an axial hole and a movable sleeve. The front of the trigger plate 993 is provided with an inclined surface near the bottom. One end of the top of the trigger plate 993 is fixedly installed with a tooth block 994 by welding. The tooth block 994 is engaged with the ratchet bar 989 through a ratchet structure. The top of the sliding seat 992 is movably installed with a travel rod 995 through sliding cooperation. The bottom of the sliding seat 992 is fixedly installed with a reset spring 996 through a clamping connection. One end of the bottom of the reset spring 996 is connected to the travel rod 995 through a clamping connection. The top of the travel rod 995 is provided with an adjusting rod 997 through a threaded connection sleeve, which is engaged with the adjusting gear Ⅰ85 through the back of the slide rail 92 by gear meshing, so that the adjusting motor Ⅰ86 drives the adjusting gear Ⅰ85 to rotate During the movement, the adjusting device 9 as a whole will not stop moving in the direction close to the lithium battery 5, and finally the bottom of the travel rod 995 will contact the top of the lithium battery 5, so that the travel rod 995 is displaced and the top of the adjusting rod 997 is in contact with the trigger plate 993, and the trigger plate 993 rotates so that the locking tooth block 994 is disengaged from the ratchet bar 989, and the intrusion device 98 is released. No manual intervention is required in the whole process, which improves the automation of the device. In addition, the extension length of the adjusting rod 997 can be adjusted by rotating the adjusting rod 997, thereby changing the distance between the top of the adjusting rod 997 and the trigger plate 993. When the distance is large, the distance between the intrusion device 98 and the lithium battery 5 is small when the intrusion device 98 is released. When the distance is large, the distance between the intrusion device 98 and the lithium battery 5 is large when the intrusion device 98 is released, thereby realizing the adjustment of the distance between the intrusion device 98 and the lithium battery 5 when it is released as needed, so that the obtained experimental data is more accurate.

[0039] The method of use of the present invention is as follows:

[0040] During the experiment, according to the experimental requirements, the adjusting motor II 93 is used to drive the adjusting gear II 94 to rotate, so that the overall inclination angle of the adjusting device 9 can be adjusted, thereby changing the incident angle when the intrusion device 98 contacts the top of the lithium battery 5 during the experiment, so that the bottom of the intrusion rod 981 can penetrate the top of the lithium battery 5 at a certain inclination angle, thereby better simulating the state of the battery after being hit by projectiles from various directions in actual situations. The high-pressure gas is injected into the interior of the connecting rod 91 by means of pressurization by the air compressor 12. As the pressure in the inner cavity of the connecting rod 91 increases, the force acting on the intrusion device 98 also increases continuously. The greater the kinetic energy of the intrusion device 98 after it is out of the clamping state, the more kinetic energy it has, and the penetration is achieved through its own kinetic energy. The adjusting motor Ⅰ86 drives the adjusting gear Ⅰ85 to rotate, and the adjusting device 9 as a whole will not stop moving in the direction close to the lithium battery 5, and finally the bottom of the travel rod 995 contacts the top of the lithium battery 5, so that the travel rod 995 is displaced and the top of the adjusting rod 997 contacts the trigger plate 993, and the trigger plate 993 rotates to disengage the tooth block 994 from the ratchet bar 989, and the intrusion device 98 is released at this time. No manual intervention is required in the whole process, which improves the automation of the device. In addition, the extension length of the adjusting rod 997 can be adjusted by rotating the adjusting rod 997, so as to change the distance between the top of the adjusting rod 997 and the trigger plate 993. When the distance is large, the intrusion device 98 is released. When the distance between the intrusion device 98 and the lithium battery 5 is small, when the distance is large, the distance between the intrusion device 98 and the lithium battery 5 is large when the intrusion device 98 is released, and the air compressor 12 injects high-pressure gas into the interior of the connecting rod 91, and the high-pressure gas enters the interior of the intrusion rod 981 through the guide hole 987, so that the internal gas pressure of the intrusion rod 981 increases synchronously, and the pressure acts on the top of the travel block 983, so that the travel block 983 is displaced. Since the bottom end of the travel spring 986 is connected to the top of the travel block 983 by snapping, the higher the gas pressure inside the intrusion rod 981, the greater the displacement distance of the travel block 983, so that the angle between the upper penetration plate 984 and the lower penetration plate 985 is reduced, and the degree of lateral expansion is greater, thereby increasing the intrusion of the intrusion rod 981. The penetration area makes the wound formed by the bottom of the intrusion rod 981 larger after contacting and invading the top of the lithium battery 5, so as to better simulate the high-speed moving fragments that will deform first after contacting the lithium battery 5, so that the contact area between the fragments and 15 is increased, and the breach formed by the invasion is more obvious. The exposed area of ​​the breach formed by the invasion is larger, and more air will come into contact with the exposed battery cells of the breach, so as to obtain the safety performance of the lithium battery under such extreme conditions. After the high-pressure gas enters the interior of the connecting rod 91, the top of the rubber sleeve 96 is deformed under the action of the high-pressure gas, so that its inner wall can fit the outer surface of the intrusion rod 981 to prevent the high-pressure gas from leaking out, and when the intrusion device 98 is released, when the guide hole 987 moves to the rubber sleeve 96,Since the distance between the two is small, the gas intruding into the rod 981 is blocked from leaking out through the guide hole 987.

Claims

1. A safety performance testing device for lithium batteries, characterized in that: The invention comprises a back plate (1), wherein a connecting plate (2) is fixedly mounted at positions near the left and right sides of the bottom of the front side of the back plate (1), a spring rod (3) is movably mounted on one side of the connecting plate (2), a clamping plate (4) is fixedly mounted on one end of the spring rod (3), a lithium battery (5) is fixedly mounted on one side of the clamping plate (4), a support frame (6) is fixedly mounted on the bottom of the connecting plate (2), a connecting hole (7) is opened at a position near the bottom of the middle of the front side of the back plate (1), a rotating device (8) is movably sleeved inside the connecting hole (7) via a bearing, an adjusting device (9) is movably mounted on one end of the rotating device (8), and a portion of the front side of the back plate (1) located above the connecting hole (7) is provided with a connecting hole (7). A mounting plate (10) is fixedly mounted on the position, an arc-shaped rack (11) is fixedly mounted on the front of the mounting plate (10), and an air compressor (12) is fixedly mounted on the top of the mounting plate (10); the rotating device (8) comprises a rotating seat (81), the rotating seat (81) is movably sleeved with the connecting hole (7) through a bearing connection, a transverse plate (82) is fixedly mounted on one side of the rotating seat (81), a limit seat (83) is fixedly mounted on one end of the transverse plate (82), an adjusting device (9) is movably mounted on one side of the limit seat (83), a rib plate (84) is fixedly mounted on the top of the transverse plate (82) near both sides, and a rib plate (84) is movably mounted on the inner side of the rib plate (84) near the top The movable sleeve is provided with an adjusting gear I (85), and an adjusting motor I (86) is fixedly installed at a position corresponding to the adjusting gear I (85) on the outer side of the rib plate (84), and the output shaft of the adjusting motor I (86) is fixedly connected to the adjusting gear I (85); the adjusting device (9) comprises a connecting rod (91), and the output end of the air compressor (12) is connected to the outer surface of the connecting rod (91) near the top through a pipeline, and a slide rail (92) is provided on the back side of the outer surface of the connecting rod (91), and the slide rail (92) is connected to the limit seat (83) through sliding cooperation, and the back side of the slide rail (92) cooperates with the adjusting gear I (85) through gear meshing, and the outer surface of the connecting rod (91) An adjusting motor II (93) is fixedly mounted at a position near the top of the back side, an adjusting gear II (94) is fixedly mounted at one end of the output shaft of the adjusting motor II (93), the adjusting gear II (94) is connected to the arc-shaped rack (11) through gear tooth meshing, a travel hole (95) is formed at the bottom of the connecting rod (91), a rubber sleeve (96) is provided at a position near the top of the inner wall of the travel hole (95), a sleeve hole (97) is formed at the top of the connecting rod (91), the sleeve hole (97) is connected to the travel hole (95), an intrusion device (98) is movably mounted inside the sleeve hole (97), and a trigger device (99) is fixedly mounted on the front side of the outer surface of the connecting rod (91);The intrusion device (98) comprises an intrusion rod (981), the bottom of the intrusion rod (981) is set as a pointed head, side holes (982) are opened on both sides of the outer surface of the intrusion rod (981), a travel block (983) is movably installed inside the intrusion rod (981), upper penetration plates (984) are movably sleeved at positions near the bottom on both sides of the outer surface of the travel block (983), and lower penetration plates (984) are movably sleeved at positions below the side holes (982) on both sides of the outer surface of the intrusion rod (981). The bottom of the upper penetration plate (984) is connected to the top of the lower penetration plate (985), a travel spring (986) is fixedly installed on the inner wall of the intrusion rod (981) at a position above the travel block (983), one end of the bottom of the travel spring (986) is connected to the top of the travel block (983), guide holes (987) are opened at positions close to the bottom on both sides of the outer surface of the intrusion rod (981), and a connecting rod ( 988), a ratchet bar (989) is fixedly mounted on the top of the connecting rod (988), the ratchet bar (989) is connected to a trigger device (99), the trigger device (99) comprises a spring shaft seat (991) and a sliding seat (992), the spring shaft seat (991) is mounted on the outer surface of the connecting rod (91) at a position close to the top, the top movable sleeve of the spring shaft seat (991) is provided with a trigger plate (993), and the trigger plate (993) is provided at a position close to the bottom on the front side. There is an inclined surface, a tooth block (994) is fixedly installed at one end of the top of the trigger plate (993), and the tooth block (994) is connected to the ratchet bar (989) through a ratchet structure. A travel rod (995) is movably installed on the top of the sliding seat (992), and a return spring (996) is fixedly installed at the bottom of the sliding seat (992). One end of the bottom of the return spring (996) is connected to the travel rod (995), and an adjustment rod (997) is sleeved on the top of the travel rod (995). ; 2. A safety performance testing device for lithium batteries according to claim 1, characterized in that: The connecting rod (988) and the sleeve hole (97) are movably sleeved, and a gap is left between the rubber sleeve (96) and the intrusion rod (981).

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