A lithium ion battery extrusion testing device and method

Abstract

The present invention relates to the technical field of lithium battery compression test, specifically a lithium ion battery extrusion test device and method, including a test bench, a top surface of the test bench and symmetrically provided with protective boxes on the left and right sides, a material placement table welded between the bottoms of a pair of protective boxes, and the two protective boxes are provided with extrusion parts for applying pressure to the lithium battery placed on the material placement table from different directions, and a protective part for fire isolation and temperature reduction is provided above the test bench. The present invention places lithium batteries on a material placement table, and the extrusion parts provided on both sides of the material placement table perform extrusion tests on the sides and corners of the lithium battery. A servo motor is used to rotate forward and reverse to drive transmission groups at different positions to alternately extend into the material placement table, and the side pressure plates and corner pressure plates are driven to squeeze the sides and corners of the lithium battery for extrusion tests, so that the test safety data is more comprehensive.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery compression test, in particular to a lithium ion battery compression test device and method. Background Art

[0002] The lithium battery squeeze test is a safety performance test that simulates the battery being squeezed by external force. The test is designed to evaluate whether the internal structure and materials of the battery can remain stable when subjected to physical pressure, and whether there will be safety risks such as short circuit, combustion or explosion. During the test, the battery is usually placed in a specific device, and then a certain amount of pressure is applied to simulate the squeezing process. During this process, the tester will closely observe the battery's response, including changes in appearance, voltage, etc.

[0003] Application number CN202321309966.4 discloses a lithium-ion battery module extrusion test device, including a body and a partition mechanism, wherein the body is internally installed with a partition mechanism for processing the lithium-ion battery after the test, and the partition mechanism includes a hydraulic cylinder, a pressure plate, a rotating shaft, a support, a cylinder, a movable plate, a torsion spring and an isolation chamber, wherein the body is internally installed with a support for placing the lithium-ion battery to be tested, and a rotating shaft is installed at the connection between the support and the body and at the connection between the power end of the cylinder and the support, when the battery explodes during the extrusion test, the cylinder can be controlled to operate, and its power end lifts one end of the support so that the support flips around the rotating shaft at the other end, so that the battery on its surface slides from the position of the movable plate into the isolation chamber for subsequent processing, thereby reducing the impact of the battery explosion on the interior of the detection chamber and facilitating and quickly performing subsequent detection operations.

[0004] The above patent only uses a frontal extrusion test when conducting an extrusion test on lithium batteries. However, since products equipped with lithium batteries may be squeezed in different directions and damaged during actual use, the lithium batteries need to be tested before leaving the factory to simulate actual conditions in order to understand the safety and stability of the lithium batteries. Summary of the invention

[0005] In order to overcome the defects in the prior art, the purpose of the present invention is to provide a lithium ion battery extrusion testing device and method thereof to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, on the one hand, the present invention provides a lithium-ion battery extrusion test device, comprising a test bench, a top surface of the test bench and symmetrically provided with protection boxes on the left and right sides, a material placement table welded between the bottoms of a pair of the protection boxes, and the two protection boxes are provided with extrusion parts for applying pressure to the lithium battery placed on the material placement table from different directions, and a protection part for fire isolation and temperature reduction is provided above the test bench;

[0007] The extrusion part includes a side pressure plate parallel to the side wall of the protection box toward the material placement table, a pair of angle pressure plates obliquely connected to the side wall of the protection box toward the material placement table, and a transmission group vertically sleeved on the inner sides of the side pressure plate and the angle pressure plate; a V-shaped clamping groove is provided in the middle of the outer side surface of the angle pressure plate; two angle pressure plates are respectively located at the two ends of the side pressure plate, and the angle between the two angle pressure plates is an obtuse angle, a support plate is clamped between the inner sides of the bottom of the protection box, the side pressure plate and the two angle pressure plates are slidably connected to the top surface of the support plate, a servo motor is installed on the bottom surface of the test bench and below the protection box, and the servo motor is used to drive the transmission group in the middle and the remaining two transmission groups to extend into the material placement table separately;

[0008] The protection part includes a protective cover arranged with the test bench cover, an ignition cover arranged in the middle of the protective cover, and a lifting frame installed at the rear of the test bench and used to guide the lifting and lowering of the protective cover; the ignition cover is located directly above the material placement table, and when the protective cover is matched with the test bench cover, the ignition cover is lowered to the top of the lithium battery on the material placement table, and storage boxes are arranged inside the protective cover and on the left and right sides of the ignition cover, and low-temperature materials are placed in the storage boxes.

[0009] As a further improvement of the technical solution, the protective box is provided with a side panel opening in the middle of the side wall facing the material loading platform, the side pressure plate is matched and snap-fitted with the side panel opening, angle panel openings are provided on both sides of the side panel opening, the angle pressure plate is matched and snap-fitted with the angle panel opening, the wide side end of the support plate is a vertically bent end, and the top surface of the support plate is flush with the top surface of the material loading platform.

[0010] As a further improvement of the present technical solution, a side plate sleeve is vertically provided at the middle inner part of the side pressure plate, and a corner plate sleeve is vertically provided at the middle inner part of the angle pressure plate; three pairs of limit plates are provided on the top surface of the support plate and close to the edge of the loading platform, one pair of limit plates is located in the middle of the side of the support plate, and the other two pairs of limit plates are located at the corners of the support plate and are inclined, the side plate sleeve is clamped and slidably connected with the pair of limit plates located in the middle, and the corner plate sleeve is clamped and slidably connected with the pair of limit plates arranged at an inclination.

[0011] As a further improvement of the present technical solution, the transmission group includes a transmission rod, a transmission gear meshing with the side of the transmission rod, and a rectangular spring sleeved in one end of the transmission rod; the lower half of the side of the transmission rod is provided with a plurality of conical convex teeth meshing with the transmission gear, and the plurality of transmission rods are correspondingly sleeved with the side plate sleeves and the two corner plate sleeves, and both ends of the rectangular spring are fixedly connected.

[0012] As a further improvement of the present technical solution, a linkage gear plate is coaxially connected below the transmission gear, and the linkage gear plate is located below the support plate. The output shaft of the servo motor passes through the bottom of the support plate and is sleeved with an active gear plate. The active gear plate meshes with two of the linkage gear plates, and these two linkage gear plates are respectively located behind the side pressure plate and behind one of the angle pressure plates. The lower half of the active gear plate is sleeved with a transmission belt, and the transmission belt is sleeved with the linkage gear plate behind the other angle pressure plate.

[0013] As a further improvement of the present technical solution, an ignition port which is sleeved with the ignition hood is provided in the middle of the top surface of the protective cover, a fire-isolating hood is elastically sleeved inside the bottom of the ignition hood, a plurality of air holes are provided on the outer wall of the fire-isolating hood in a lattice pattern, a fixing ring is welded at the inner corner of the top of the fire-isolating hood, a lifting column is sleeved in the center hole of the fixing ring, the top of the lifting column is plugged into and fitted with the top surface of the ignition hood, a compression spring is sleeved on the outside of the lifting column, and the compression spring is located on the top surface of the fixing ring.

[0014] As a further improvement of the technical solution, a number of guide frames are welded to the middle of the bottom side and the corners of the fire hood, the outer ends of the guide frames are provided with inclined surfaces inclined downward, and the guide frames are in sliding contact with a pair of side pressure plates and a number of corner pressure plates; a connecting pipe head is provided in the middle of the top surface of the fire ignition hood.

[0015] As a further improvement of the technical solution, a sliding frame is welded at the bottom edge of the rear side of the protective cover and is slidably engaged with both sides of the lifting frame. A threaded ring is provided in the middle of the sliding frame. A forward and reverse motor is installed at the bottom of the rear side of the lifting frame. A screw rod is coaxially connected to the output shaft end of the forward and reverse motor, and the screw rod is threadedly connected to the threaded ring.

[0016] As a further improvement of the technical solution, a storage port is provided on the top surface of the protective cover and the water stop valve located on the protective box, and the storage box is matched and plugged into the storage port; a plurality of rollers are vertically arranged at equal intervals on the top of the rear side of the sliding frame, and the plurality of rollers are rollingly connected to the rear side of the lifting frame.

[0017] On the other hand, the present invention provides a lithium ion battery extrusion test method, using the above-mentioned lithium ion battery extrusion test device, comprising the following steps:

[0018] S1. Place the lithium battery in the middle of the loading table, with its left and right sides facing the two protective boxes;

[0019] S2, then start the forward and reverse motors to drive the protective cover down to the test bench, and at the same time, the ignition cover presses the fireproof cover to fall on the top surface of the lithium battery;

[0020] S3, restart the servo motor to drive the side pressure plate to squeeze the side of the lithium battery until the lithium battery is destroyed and catches fire. During this process, the tester measures the voltage change with a special voltmeter;

[0021] S4. After the lithium battery catches fire, it will rise along the ignition cover, so that the gas inside the protective cover will be drained from the several air holes of the fireproof cover to the lithium battery. The low-temperature material in the storage box provides low temperature to reduce the temperature generated by the lithium battery fire;

[0022] S5. Raise the protective cover again and replace a new lithium battery, and put it in the middle of the loading table with its four corners facing the four corner plate openings;

[0023] S6, then start the forward and reverse motors to drive the protective cover down to the test bench, and at the same time, the ignition cover presses the fireproof cover to fall on the top surface of the lithium battery;

[0024] S3. Restart the servo motor to reverse and drive the angle pressure plate to squeeze the corner of the lithium battery until the lithium battery is destroyed and catches fire. During this process, the tester measures the voltage change with a special voltmeter.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The lithium-ion battery extrusion test device and method thereof place lithium batteries on a material placement table, and perform extrusion tests on the sides and corners of the lithium batteries using extrusion parts arranged on both sides of the material placement table. A servo motor is used to drive transmission groups at different positions to alternately extend into the material placement table, and correspondingly drive side pressure plates and corner pressure plates to squeeze the sides and corners of the lithium batteries for extrusion tests, so that the test safety data is more comprehensive.

[0027] 2. The lithium-ion battery extrusion test device and method thereof start the forward and reverse motors to drive the protective cover to drop to the test bench through the provided protective part, and at the same time, the ignition cover presses the fireproof cover to fall on the top surface of the lithium battery, and uses the guide frame to slide along the top surface of the side pressure plate or the angle pressure plate to ensure that the side pressure plate or the angle pressure plate completely squeezes the lithium battery for testing, that is, it can be applied to the extrusion test of lithium batteries with different thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0029] Figure 1 It is a schematic diagram of the overall assembly structure of the present invention;

[0030] Figure 2 It is the overall front view of the present invention;

[0031] Figure 3 The test bench and protective cover assembly split diagram of the present invention;

[0032] Figure 4 It is a schematic diagram of the structure of the extrusion part and the ignition cover of the present invention;

[0033] Figure 5 A top view of the extrusion part of the present invention extruding the side of the battery;

[0034] Figure 6 A top view of the extrusion portion of the present invention extruding a battery corner;

[0035] Figure 7 It is a schematic diagram of the assembly structure of the extrusion part of the present invention;

[0036] Figure 8 It is a partial exploded view of the extrusion part of the present invention;

[0037] Fig. 9 It is an exploded view of the side pressure plate and the corner pressure plate of the present invention;

[0038] Fig.10 It is a disassembled diagram of the ignition cover and the fireproof cover of the present invention;

[0039] Fig.11 It is a schematic diagram of the assembly structure of the protection part of the present invention;

[0040] Fig.12 It is a partial exploded view of the protection part of the present invention;

[0041] The meaning of each number in the figure is:

[0042] 100, test bench; 110, protection box; 111, material placement table; 112, side panel opening; 113, corner panel opening;

[0043] 200, extrusion part; 210, side pressure plate; 211, side plate sleeve; 220, angle pressure plate; 221, angle plate sleeve; 230, transmission group; 231, transmission rod; 2311, conical convex teeth; 232, transmission gear; 2321, linkage gear plate; 233, rectangular spring; 240, servo motor; 241, active gear plate; 242, transmission belt; 250, support plate; 251, limit plate;

[0044] 300, protection part; 310, protection cover; 311, ignition port; 312, storage port; 313, sliding frame; 314, threaded ring; 320, ignition cover; 3201, connecting pipe head; 321, fireproof cover; 3211, air hole; 3212, fixing ring; 322, guide frame; 323, lifting column; 324, compression spring; 330, lifting frame; 331, screw rod; 332, forward and reverse motor; 340, roller; 350, storage box. DETAILED DESCRIPTION

[0045] The details of the present invention can be more clearly understood by combining the accompanying drawings with the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as falling within the scope of the present invention. The terms "installation" and "connection" should be understood in a broad sense, which can be directly connected or indirectly connected through an intermediate medium.

[0046] The terms "central axis", "vertical", "horizontal", "front", "back", "up", "down", "left", "right", "top", "bottom", "inside", "outside" and the like used herein to indicate positions or positional relationships are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0047] See also Figure 1-Figure 12 As shown, the present invention provides a lithium-ion battery extrusion test device, including a test bench 100, a top surface of the test bench 100 and symmetrically provided with protective boxes 110 on both sides, a material placement table 111 welded between the bottoms of a pair of protective boxes 110, and extrusion parts 200 for applying pressure to the lithium battery placed on the material placement table 111 from different directions are arranged inside the two protective boxes 110. Since products equipped with lithium batteries will be squeezed in different directions and damaged during actual use, the test of lithium batteries before leaving the factory needs to simulate the actual situation to perform extrusion tests, so as to understand the safety and stability of the lithium batteries; a protective part 300 for fire isolation and cooling is arranged above the test bench 100, so that the lithium battery under test can be cooled and protected, thereby ensuring the environmental safety of the test site.

[0048] Specifically, the extrusion part 200 includes a side pressure plate 210 parallel to the side wall of the protection box 110 toward the material placement table 111, a pair of angle pressure plates 220 obliquely connected to the side wall of the protection box 110 toward the material placement table 111, and a transmission group 230 vertically sleeved on the inner sides of the side pressure plate 210 and the angle pressure plate 220; the side of the lithium battery is squeezed for testing by a pair of side pressure plates 210 of the two extrusion parts 200, and the corner of the lithium battery is squeezed for testing by four pairs of angle pressure plates 220 of the two extrusion parts 200; the two angle pressure plates 220 are respectively located at the two ends of the side pressure plate 210, and the angle between the two angle pressure plates 220 is an obtuse angle, and a V-shaped clamping groove is opened in the middle of the outer side surface of the angle pressure plate 220; when the angle pressure plate 220 approaches the corner of the lithium battery, the corner of the lithium battery is automatically clamped by the guidance of its clamping groove to perform the extrusion test;

[0049] A support plate 250 is clamped between the inner sides of the bottom of the protection box 110, and the side pressure plate 210 and the two corner pressure plates 220 are slidably connected to the top surface of the support plate 250. A servo motor 240 is installed on the bottom surface of the test bench 100 and below the protection box 110. The servo motor 240 is used to drive the transmission group 230 in the middle and the other two transmission groups 230 to extend into the material placement table 111 separately; that is, the transmission groups 230 at different positions are driven to alternately extend into the material placement table 111 by the forward and reverse rotation of a servo motor 240, so as to squeeze different positions of the lithium battery for extrusion testing.

[0050] Furthermore, a side panel opening 112 is opened in the middle of the side wall of the protective box 110 facing the loading platform 111, and the side pressure plate 210 is matched and snap-fitted with the side panel opening 112. Angle panel openings 113 are opened on both sides of the side panel opening 112, and the angle pressure plate 220 is matched and snap-fitted with the angle panel opening 113. The wide side end of the support plate 250 is a vertically bent end, and the top surface of the support plate 250 is flush with the top surface of the loading platform 111, so that the side pressure plate 210 and the angle pressure plate 220 can slide smoothly onto the loading platform 111.

[0051] Furthermore, a side plate sleeve 211 is vertically provided at the middle inner side of the side pressure plate 210, and a corner plate sleeve 221 is vertically provided at the middle inner side of the corner pressure plate 220; three pairs of limit plates 251 are provided on the top surface of the support plate 250 and close to the edge of the loading platform 111, wherein one pair of limit plates 251 is located in the middle of the side edge of the support plate 250, and the other two pairs of limit plates 251 are located at the corners of the support plate 250 and are inclined. The side plate sleeve 211 is engaged and slidably connected with the pair of limit plates 251 located in the middle, and the corner plate sleeve 221 is engaged and slidably connected with the pair of limit plates 251 inclinedly connected, so that the side pressure plate 210 and the corner pressure plate 220 squeeze the lithium battery in a predetermined direction.

[0052] Specifically, the transmission group 230 includes a transmission rod 231, a transmission gear 232 meshing with the side of the transmission rod 231, and a rectangular spring 233 sleeved in one end of the transmission rod 231. One end of the transmission rod 231 is provided with a groove for receiving the rectangular spring 233; the lower half of the side of the transmission rod 231 is provided with a plurality of conical convex teeth 2311 meshing with the transmission gear 232, and the distribution range of the plurality of conical convex teeth 2311 occupies half of the long side of the transmission rod 231. ; Several transmission rods 231 are correspondingly sleeved with the side plate sleeves 211 and the two angle plate sleeves 221, and both ends of the rectangular spring 233 are fixedly connected, that is, one end of the rectangular spring 233 is bonded to the inner end of the groove of the transmission rod 231, and the other end is bonded to the inner end of the side plate sleeve 211. Similarly, the rectangular spring 233 is also fixedly connected to the angle plate sleeve 221, so that when the transmission rod 231 moves toward the material placement table 111, it pushes the side pressure plate 210 or the angle pressure plate 220 to squeeze the lithium battery;

[0053] When the transmission rod 231 is driven away from the loading platform 111 by the transmission gear 232, the rectangular spring 233 prevents the transmission rod 231 from slipping and can always mesh with the transmission gear 232, ensuring that the transmission gear 232 can drive the transmission rod 231 to move in time after reverse rotation.

[0054] Furthermore, a linkage toothed disc 2321 is coaxially connected to the lower part of the transmission gear 232, and the linkage toothed disc 2321 is located below the support plate 250. The connecting shaft between the transmission gear 232 and the linkage toothed disc 2321 passes through the support plate 250. The output shaft of the servo motor 240 passes through the lower part of the support plate 250 and is sleeved with an active toothed disc 241. The active toothed disc 241 meshes with two of the linkage toothed discs 2321, and the two linkage toothed discs 2321 are respectively located behind the side pressure plate 210 and one of the side pressure plates 210. Behind one angle pressure plate 220, the tooth height of the linkage toothed disc 2321 and the active toothed disc 241 is half of the disc body, and the lower half of the active toothed disc 241 is sleeved with a transmission belt 242, which is sleeved with the linkage toothed disc 2321 behind the other angle pressure plate 220, and a pin is embedded in the limiting plate 251 located in the middle on the support plate 250, and the side of the transmission belt 242 close to the side pressure plate 210 bypasses the outside of the pin to avoid interference with the transmission group 230 behind the side pressure plate 210;

[0055] The servo motor 240 drives the active gear disc 241 to rotate, driving the interlocking gear disc 2321 behind the side pressure plate 210 to reverse with it, and also driving the interlocking gear disc 2321 behind the angle pressure plate 220 close to the servo motor 240 to reverse with it. Since a number of conical convex teeth 2311 on the sides of the two transmission rods 231 above the two interlocking gear discs 2321 are relatively arranged, the two transmission rods 231 will move in the opposite direction; in addition, the other interlocking gear disc 2321 rotates synchronously with the active gear disc 241, that is, the transmission rods 231 behind the two angle pressure plates 220 move synchronously, so that when the servo motor 240 rotates forward and reversely, it can alternately drive the side pressure plate 210 and the two angle pressure plates 220 to telescope.

[0056] In addition, the protection part 300 includes a protective cover 310 that is covered with the test bench 100, an ignition cover 320 arranged in the middle of the protective cover 310, and a lifting frame 330 installed at the rear of the test bench 100 and used to guide the lifting and lowering of the protective cover 310; the ignition cover 320 is located directly above the loading platform 111. When the protective cover 310 is matched with the test bench 100, the ignition cover 320 is lowered to above the lithium battery on the loading platform 111. Inside the protective cover 310 and on the left and right sides of the ignition cover 320, there are storage boxes 350. Low-temperature materials, preferably ice cubes, are placed in the storage boxes 350 to provide cold air so that the lithium battery can be cooled after catching fire.

[0057] Furthermore, a fire-starting port 311 is provided in the middle of the top surface of the protective cover 310, and the fire-starting cover 320 is sleeved with a fire-shielding cover 321. The bottom of the fire-starting cover 320 is elastically sleeved with a fire-shielding cover 321. The outer wall of the fire-shielding cover 321 is provided with a plurality of air holes 3211 in a lattice pattern, so that cold air can enter and cool down the lithium battery. A fixing ring 3212 is welded at the inner corner of the top of the fire-shielding cover 321. A lifting column 323 is sleeved in the center hole of the fixing ring 3212. The top of the lifting column 323 is plugged with the top surface of the fire-starting cover 320. The bottom end of the lifting column 323 is tightly sleeved with a circular ring, and the outer diameter of the circular ring is larger than the inner diameter of the fixing ring 3212, so as to form a limit. When the protective cover 310 is raised, the fire-shielding cover 321 can be lifted by using a plurality of lifting columns 323.

[0058] The outer sleeve of the lifting column 323 is provided with a compression spring 324, and the compression spring 324 is located on the top surface of the fixing ring 3212; when the fireproof cover 321 presses down the lithium battery and the lithium battery is squeezed, the fireproof cover 321 can bounce up to avoid it, ensuring that the lithium battery is fully squeezed.

[0059] Furthermore, a plurality of guide frames 322 are welded at the middle part and corner of the bottom side of the fireproof cover 321, and the outer end of the guide frame 322 is provided with an inclined surface inclined downward, and the plurality of guide frames 322 are in sliding contact with a pair of side pressure plates 210 and a plurality of angle pressure plates 220; so as to contact with the bottom edge of the side pressure plate 210 or the angle pressure plate 220, and support the guide frame 322 to slide along the top surface of the side pressure plate 210 or the angle pressure plate 220, so as to ensure that the side pressure plate 210 or the angle pressure plate 220 completely squeezes the lithium battery for testing; that is, when the thickness of the lithium battery is less than the height of the side pressure plate 210, the guide frame 322 plays a role;

[0060] A pipe joint 3201 is protruded in the middle of the top surface of the ignition hood 320, and smoke can be directed to other places or discharged for purification or filtered and absorbed by connecting the pipe joint 3201 to the pipe.

[0061] Furthermore, a sliding frame 313 is welded at the bottom edge of the rear side of the protective cover 310, which is engaged and slidable with the two sides of the lifting frame 330. A threaded ring 314 is provided in the middle of the sliding frame 313. A forward and reverse motor 332 is installed at the bottom of the rear side of the lifting frame 330. A screw rod 331 is coaxially connected to the output shaft end of the forward and reverse motor 332. The screw rod 331 is threadedly connected to the threaded ring 314. The screw rod 331 is driven to rotate by the forward and reverse motor 332, and the protective cover 310 is driven to rise and fall along the lifting frame 330 through the threaded ring 314.

[0062] A storage port 312 is provided on the top surface of the protective cover 310 and on the water stop valve of the protective box 110, and the storage box 350 is matched and plugged into the storage port 312 so that the storage box 350 can be easily taken out and placed; a plurality of rollers 340 are vertically evenly spaced at the top of the rear side of the sliding frame 313, and the plurality of rollers 340 are rollingly connected to the rear side of the lifting frame 330, so that the protective cover 310 can be raised and lowered smoothly.

[0063] The present invention also provides a lithium ion battery extrusion test method, using the above lithium ion battery extrusion test device, comprising the following steps:

[0064] S1. Place the lithium battery in the middle of the loading platform 111, with its left and right sides facing the two protection boxes 110;

[0065] S2, then start the forward and reverse motor 332 to drive the protective cover 310 to fall onto the test bench 100, and at the same time, the ignition cover 320 presses the fire isolation cover 321 to fall on the top surface of the lithium battery;

[0066] S3, restarting the servo motor 240 to drive the side pressure plate 210 to squeeze the side of the lithium battery until the lithium battery is destroyed and catches fire. During this process, the tester measures the voltage change with a special voltmeter;

[0067] S4. After the lithium battery catches fire, it will rise along the ignition cover 320, so that the gas inside the protective cover 310 will be guided to the lithium battery through the plurality of air holes 3211 of the fireproof cover 321, and the low-temperature material in the storage box 350 provides low temperature to reduce the temperature generated by the lithium battery fire;

[0068] S5, raise the protective cover 310 again and replace a new lithium battery, and put it in the middle of the material placement table 111, with its four corners facing the four corner plate openings 113;

[0069] S6, then start the forward and reverse motor 332 to drive the protective cover 310 to fall onto the test bench 100, and at the same time, the ignition cover 320 presses the fire isolation cover 321 to fall on the top surface of the lithium battery;

[0070] S3, restarting the servo motor 240 to reversely drive the angle pressure plate 220 to squeeze toward the corner of the lithium battery until the lithium battery is destroyed and catches fire. During this process, the tester measures the voltage change with a special voltmeter.

[0071] It should be noted that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A lithium-ion battery extrusion testing device, comprising a testing table (100), characterized in that: A protective box (110) is symmetrically arranged on the top surface and on the left and right sides of the test bench (100); a material placement table (111) is welded between the bottoms of a pair of the protective boxes (110); a pressing portion (200) for applying pressure to a lithium battery placed on the material placement table (111) from different directions is arranged inside the two protective boxes (110); and a protective portion (300) for fire isolation and temperature reduction is arranged above the test bench (100); The extrusion portion (200) comprises a side pressure plate (210) parallel to the side wall of the protection box (110) facing the material placement platform (111), a pair of angle pressure plates (220) obliquely connected to the side wall of the protection box (110) facing the material placement platform (111), and a transmission group (230) vertically sleeved on the inner sides of the side pressure plate (210) and the angle pressure plate (220); a V-shaped clamping groove is provided in the middle of the outer side surface of the angle pressure plate (220); the two angle pressure plates (220) are respectively located at the two ends of the side pressure plate (210), and The included angle of the two angle pressure plates (220) is an obtuse angle, a support plate (250) is clamped between the inner sides of the bottom of the protection box (110), the side pressure plate (210) and the two angle pressure plates (220) are slidably connected to the top surface of the support plate (250), and a servo motor (240) is installed on the bottom surface of the test bench (100) and below the protection box (110), and the servo motor (240) is used to drive the transmission group (230) in the middle and the other two transmission groups (230) to extend into the material placement table (111) separately; The protection part (300) comprises a protection cover (310) which is covered with the test bench (100), an ignition cover (320) which is arranged in the middle of the protection cover (310), and a lifting frame (330) which is installed at the rear of the test bench (100) and is used to guide the protection cover (310) to rise and fall; the ignition cover (320) is located directly above the material placement platform (111); when the protection cover (310) and the test bench (100) are covered and matched, the ignition cover (320) is lowered to the top of the lithium battery on the material placement platform (111); and storage boxes (350) are arranged inside the protection cover (310) and on the left and right sides of the ignition cover (320); low-temperature materials are placed in the storage boxes (350).

2. The lithium-ion battery extrusion testing device according to claim 1, characterized in that: The protective box (110) is provided with a side panel opening (112) in the middle of the side wall facing the material placement platform (111); the side pressure plate (210) is matched and snap-fitted with the side panel opening (112); angle panel openings (113) are provided on both sides of the side panel opening (112); the angle pressure plate (220) is matched and snap-fitted with the angle panel opening (113); the wide side end of the support plate (250) is a vertically bent end, and the top surface of the support plate (250) is flush with the top surface of the material placement platform (111).

3. The lithium-ion battery extrusion testing device according to claim 2, characterized in that: A side plate sleeve (211) is vertically provided at the middle of the inner side of the side pressure plate (210), and a corner plate sleeve (221) is vertically provided at the middle of the inner side of the corner pressure plate (220); three pairs of limit plates (251) are provided on the top surface of the support plate (250) and at the edge close to the material placement platform (111), one pair of limit plates (251) is located at the middle of the side edge of the support plate (250), and the other two pairs of limit plates (251) are located at the corners of the support plate (250) and are arranged in an inclined manner; the side plate sleeve (211) is slidably engaged with the pair of limit plates (251) located in the middle, and the corner plate sleeve (221) is slidably engaged with the pair of limit plates (251) arranged in an inclined manner.

4. The lithium-ion battery extrusion testing device according to claim 3, characterized in that: The transmission group (230) comprises a transmission rod (231), a transmission gear (232) meshing with the side of the transmission rod (231), and a rectangular spring (233) sleeved inside one end of the transmission rod (231); the lower half of the side of the transmission rod (231) is provided with a plurality of conical convex teeth (2311) meshing with the transmission gear (232); the plurality of transmission rods (231) are sleeved and matched with the side plate sleeves (211) and the two corner plate sleeves (221) correspondingly; and both ends of the rectangular spring (233) are fixedly connected.

5. The lithium-ion battery extrusion testing device according to claim 4, characterized in that: A linkage toothed disc (2321) is coaxially connected below the transmission gear (232), and the linkage toothed disc (2321) is located below the support plate (250). The output shaft of the servo motor (240) passes through the bottom of the support plate (250) and is sleeved with an active toothed disc (241). The active toothed disc (241) meshes with two of the linkage toothed discs (2321), and the two linkage toothed discs (2321) are respectively located behind the side pressure plate (210) and behind one of the angle pressure plates (220). A transmission belt (242) is sleeved on the lower half of the active toothed disc (241), and the transmission belt (242) is sleeved with the linkage toothed disc (2321) behind the other angle pressure plate (220).

6. The lithium-ion battery extrusion testing device according to claim 5, characterized in that: A fire-starting port (311) is provided in the middle of the top surface of the protective cover (310) and is sleeved with the fire-starting cover (320); a fire-isolating cover (321) is elastically sleeved inside the bottom of the fire-starting cover (320); a plurality of air holes (3211) are provided on the outer wall of the fire-isolating cover (321) in a lattice pattern; a fixing ring (3212) is welded at the inner corner of the top of the fire-isolating cover (321); a lifting column (323) is sleeved in the center hole of the fixing ring (3212); the top of the lifting column (323) is plugged into the top surface of the fire-starting cover (320); a compression spring (324) is sleeved on the outside of the lifting column (323), and the compression spring (324) is located on the top surface of the fixing ring (3212).

7. The lithium-ion battery extrusion testing device according to claim 6, characterized in that: A plurality of guide frames (322) are welded to the middle of the bottom side and the corners of the fireproof cover (321); the outer ends of the guide frames (322) are provided with inclined surfaces inclined downward; the plurality of guide frames (322) are in sliding contact with a pair of side pressure plates (210) and a plurality of corner pressure plates (220); and a pipe connection head (3201) is provided in a raised middle portion of the top surface of the fireproof cover (320).

8. The lithium-ion battery extrusion testing device according to claim 7, characterized in that: A sliding frame (313) is welded to the rear bottom edge of the protective cover (310) and is slidably engaged with two sides of the lifting frame (330). A threaded ring (314) is provided in the middle of the sliding frame (313). A forward and reverse motor (332) is installed at the rear bottom of the lifting frame (330). A screw rod (331) is coaxially connected to the output shaft end of the forward and reverse motor (332). The screw rod (331) is threadedly connected to the threaded ring (314).

9. The lithium-ion battery extrusion testing device according to claim 8, characterized in that: A storage opening (312) is provided on the top surface of the protective cover (310) and on the water stop valve of the protective box (110), and the storage box (350) is matched and plugged into the storage opening (312); a plurality of rollers (340) are vertically arranged at equal intervals on the top of the rear side of the sliding frame (313), and the plurality of rollers (340) are rollingly connected to the rear side of the lifting frame (330).

10. A lithium ion battery extrusion test method, using the lithium ion battery extrusion test device according to claim 9, characterized in that: The following steps are involved: S1, placing the lithium battery in the middle of the material placement table (111), with its left and right sides facing the two protection boxes (110); S2, then starting the forward and reverse motor (332) to drive the protective cover (310) to drop onto the test bench (100), and at the same time, the ignition cover (320) presses the fire isolation cover (321) to fall onto the top surface of the lithium battery; S3, restarting the servo motor (240) to drive the side pressure plate (210) to rotate forward and squeeze the side of the lithium battery until the lithium battery is destroyed and catches fire. During this process, the tester measures the voltage change using a special voltmeter; S4, after the lithium battery catches fire, it will rise along the ignition cover (320), so that the gas inside the protective cover (310) will be guided to the lithium battery through the plurality of air holes (3211) of the fireproof cover (321), and the low-temperature material in the storage box (350) provides a low temperature to reduce the temperature generated by the lithium battery ignition; S5, raising the protective cover (310) again and replacing a new lithium battery, and placing it in the middle of the material placement table (111), with its four corners facing the four corner plate openings (113); S6, then starting the forward and reverse motor (332) to drive the protective cover (310) to drop onto the test bench (100), while the ignition cover (320) presses the fire isolation cover (321) to fall onto the top surface of the lithium battery; S7, restarting the servo motor (240) to reversely drive the angle pressure plate (220) to squeeze the corner of the lithium battery until the lithium battery is destroyed and catches fire. During this process, the tester measures the voltage change using a special voltmeter.

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