An adjustable tilt angle extrusion device and testing method for mechanical abuse testing of lithium-ion batteries

Abstract

The present invention belongs to the technical field of batteries, and particularly relates to a battery mechanical abuse test device and a test method. In the existing battery mechanical abuse test devices, the mechanical extrusion and impact during the mechanical abuse are perpendicular to the force-bearing surface of the battery, and it is impossible to comprehensively test the complex forces on the battery during the actual inclined mechanical abuse process. In particular, it is impossible to perform multi-angle extrusion on the battery and collect the extrusion force values at multiple angles. The inclination of the battery support plate for fixing the battery in the adjustable inclination angle extrusion device for lithium-ion battery mechanical abuse test is adjustable, which can realize multi-angle extrusion on the battery and collect the extrusion force values at multiple angles, and can comprehensively test the complex forces on the battery during the actual inclined mechanical abuse process. In addition, it can also be tested at multiple points and at different temperatures.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and particularly relates to an adjustable tilt angle extrusion device and a test method for mechanical abuse testing of lithium-ion batteries. Background Art

[0002] Electric vehicles may encounter various road conditions during driving. As the battery pack on the chassis may collide or rub against various objects. In addition, during a traffic accident, the battery pack may also be impacted and squeezed by other vehicles or obstacles. The angles and intensities of these impacts are diverse, so the forms of mechanical abuse suffered by the battery pack in practice will also be diverse.

[0003] The internal structure of a lithium-ion battery is that a separator is sandwiched between the positive and negative electrode plates as an insulating layer, and then the three-layer structure is wound or stacked to form a multi-layer structure or a wound structure of the battery cell. Therefore, the multi-layer fine structure inside the lithium-ion battery is prone to cracking and breaking under mechanical abuse, and the positive and negative electrodes come into contact with each other at the damaged part, triggering an internal short circuit, which in turn leads to battery damage and temperature rise. The heat caused by the internal short circuit may raise the temperature of the battery above the thermal runaway temperature threshold, triggering thermal runaway of the battery, which in turn leads to fire and explosion accidents. Therefore, it is very crucial to conduct mechanical abuse tests on the battery to determine the mechanical abuse tolerance boundary of the battery and the triggering effect of different types of mechanical abuse on battery thermal runaway.

[0004] Currently, general battery mechanical abuse tests usually use a universal mechanical testing machine or a horizontal mechanical stamping device to squeeze the battery horizontally and vertically. The patent number is: CN202320859530.6, and the name is: Detection testing machine for battery extrusion testing, which discloses a device that can conduct mechanical extrusion tests on batteries. However, the force applied to the battery by this device can only be perpendicular to the compressed surface of the battery, that is, this test can only squeeze or impact the battery, and cannot simulate the tilted impact state during the movement of an electric vehicle. Due to the influence of the movement and extrusion angle, the extrusion and impact are not perpendicular to the force-receiving surface of the battery, but have both extrusion and sliding shear. The deformation law of the multi-layer structure of the battery under vertical extrusion is different from that of tilted extrusion. Since tilted extrusion will cause sliding cracking of the multi-layer structure, the form of internal short circuit and the characteristics of thermal runaway will also show differences. Tilted extrusion or impact testing is very important for more comprehensively testing the safety of the battery during actual use.

[0005] Existing equipment is perpendicular to the force-receiving surface of the battery during mechanical extrusion and impact in the mechanical abuse process. Therefore, the force tests on the battery are all one-dimensional and cannot comprehensively test the complex forces of the battery during the actual tilted mechanical abuse process. In particular, it is impossible to extrude the battery at multiple angles and impossible to collect the extrusion force values at multiple angles. Summary of the Invention

[0006] In order to achieve multi-angle extrusion of the battery and collect the extrusion force values at multiple angles, the present invention proposes an adjustable tilt angle extrusion device and a test method for mechanical abuse testing of lithium-ion batteries.

[0007] To achieve the above object, the present invention is implemented as follows:

[0008] An adjustable tilt angle extrusion device for mechanical abuse testing of lithium-ion batteries includes

[0009] A top plate,

[0010] A sensor for collecting the extrusion force values in the vertical direction, the horizontal direction, and the direction perpendicular to the inclined plane;

[0011] An extrusion mechanism for applying extrusion to the battery;

[0012] A battery support plate for fixing the battery;

[0013] A planar movement mechanism for laterally and / or longitudinally moving the battery support plate on a plane;

[0014] An inclination adjustment mechanism for adjusting the inclination of the battery to achieve extrusion of the battery at different inclinations.

[0015] Preferably, the sensor includes:

[0016] A support plate force value sensor for collecting the force value received by the battery in the direction perpendicular to the support plate;

[0017] An extrusion shaft horizontal force value sensor for collecting the force values in different horizontal directions received by the extrusion shaft when extruding the battery;

[0018] An extrusion shaft vertical force value sensor for collecting the vertical force value received by the extrusion shaft.

[0019] Preferably, the extrusion mechanism includes:

[0020] An extrusion shaft fixing plate located below the top plate, provided with a fixing plate threaded hole, a light hole A, a light hole B, and a light hole C;

[0021] An extrusion shaft, the top of which is fixedly connected to the extrusion shaft fixing plate through an extrusion shaft vertical force value sensor;

[0022] The extrusion shaft limit plate is located below the extrusion shaft fixing plate, and is provided with threaded holes, a first light hole, a second light hole and a third light hole. There is an opening at the center, and an extrusion shaft limit linear bearing is arranged in the opening. A plurality of extrusion shaft horizontal force value sensors are fixedly connected circumferentially and uniformly on the inner wall of the opening. The outer peripheral wall of the extrusion shaft limit linear bearing is in movable abutment with the side wall of the extrusion shaft horizontal force value sensor. The extrusion shaft limit linear bearing is sleeved on the extrusion shaft;

[0023] The extrusion shaft fixing plate stud is rotatably connected to the top plate, threadedly connected to the fixing plate threaded hole of the extrusion shaft fixing plate, and passes through the first light hole of the extrusion shaft limit plate;

[0024] The extrusion shaft limit plate stud is rotatably connected to the top plate, passes through the A light hole of the extrusion shaft fixing plate, and is threadedly connected to the threaded hole of the extrusion shaft limit plate;

[0025] There are two positioning optical rods, which are fixedly connected to the base and the top plate. One of them passes through the second light hole of the extrusion shaft limit plate and the B light hole of the extrusion shaft fixing plate, and the other passes through the third light hole of the extrusion shaft limit plate and the C light hole of the extrusion shaft fixing plate;

[0026] The extrusion shaft limit plate stud servo motor is installed under the base and is used to drive the rotation of the extrusion shaft limit plate stud. The rotation speed of the extrusion shaft limit plate stud servo motor is adjustable;

[0027] The extrusion shaft fixing plate stud servo motor is installed under the base and is used to drive the rotation of the extrusion shaft fixing plate stud. The rotation speed of the extrusion shaft fixing plate stud servo motor is adjustable.

[0028] Preferably, the battery support plate includes a first battery support plate and a second battery support plate that are parallel to each other, and the support plate force value sensor is arranged between the first battery support plate and the second battery support plate.

[0029] The planar movement mechanism includes

[0030] The base is provided with a bottom bracket positioning block longitudinal movement guide rail and a bottom bracket positioning block transverse movement guide rail;

[0031] The bottom bracket positioning block transverse movement servo motor;

[0032] The bottom bracket positioning block longitudinal movement servo motor;

[0033] The bottom bracket positioning block is provided with a longitudinal movement threaded hole and a transverse movement threaded hole;

[0034] The limit slider includes a first limit slider and a second limit slider with the same structure. The first limit slider is slidably connected to the bottom bracket positioning block transverse movement guide rail, and the second limit slider is slidably connected to the bottom bracket positioning block longitudinal movement guide rail;

[0035] The lateral movement stud of the bottom bracket positioning block is threadedly connected to the lateral movement threaded hole. One end thereof is rotatably connected to the first limit slider through a stud limit bearing, and the other end is fixedly connected to the rotating shaft of the servo motor for the lateral movement of the bottom bracket positioning block;

[0036] The longitudinal movement stud of the bottom bracket positioning block is threadedly connected to the longitudinal movement threaded hole. One end thereof is rotatably connected to the second limit slider through a stud limit bearing, and the other end is fixedly connected to the rotating shaft of the servo motor for the longitudinal movement of the bottom bracket positioning block;

[0037] The inclination adjustment mechanism includes:

[0038] The bottom bracket is fixedly connected to the bottom bracket positioning block;

[0039] The driving gear is fixedly connected to the driving gear central shaft. The driving gear central shaft is fixedly connected to the driving gear bearing and is rotatably connected to the bottom bracket through the driving gear bearing;

[0040] The driven gear is fixedly connected to the driven gear central shaft. The driven gear central shaft is rotatably connected to the bottom bracket through the driven gear bearing and is meshed with the driving gear; A part of the outer side surface of the driven gear is cut off by a plane parallel to the driven gear central shaft to form a mounting plane, and the driven gear is fixedly connected to the battery support plate through the mounting plane;

[0041] The servo motor for the driving gear of the bottom bracket, whose rotating shaft is fixedly connected to the driving gear central shaft, is used to drive the driving gear to rotate.

[0042] Preferably, a positioning pulley central shaft is provided on the limit slider. The positioning pulley central shaft is rotatably connected with a positioning pulley. Sliding grooves matching the positioning pulley are provided on the outer sides of the longitudinal movement guide rail and the lateral movement guide rail of the bottom bracket positioning block.

[0043] Preferably, the number of the lateral movement studs and the lateral movement threaded holes of the bottom bracket positioning block is matched with the number of the longitudinal movement studs and the longitudinal movement threaded holes of the bottom bracket positioning block.

[0044] Preferably, a liquid temperature control system is further included to circulate liquids with different temperatures to the battery support plate;

[0045] The liquid temperature control system includes:

[0046] The internal pipeline is arranged inside the first battery support plate on the upper layer plate of the battery support plate;

[0047] The liquid circulation pipeline is communicated with the internal pipeline through a pipeline joint at one end and is communicated with the temperature control device at the other end;

[0048] The temperature control device includes a water pump, a heater, and a cooler. After the external liquid is heated by the heater or cooled by the cooler, it is circulated and transported by the water pump to the liquid circulation pipeline.

[0049] The present invention provides a method for testing a battery using an adjustable tilt angle extrusion device for mechanical abuse testing of lithium-ion batteries:

[0050] It includes the following steps:

[0051] Step 1 S1: Fix the battery. Fix the battery on the first battery support plate.

[0052] Step 2 S2: Adjust the tilt angle of the battery support plate

[0053] Adjust the tilt angle of the battery support plate to the target angle through the bottom bracket driving gear servo motor.

[0054] Step 3 S3: Adjust the position on the plane of the bottom bracket positioning block

[0055] Adjust the position of the bottom bracket positioning block on the plane through the bottom bracket positioning block transverse movement servo motor and the bottom bracket positioning block longitudinal movement servo motor, thereby adjusting the position of the battery being squeezed.

[0056] Step 4 S4: Adjust the vertical positions of the extrusion shaft fixing plate and the extrusion shaft limiting plate

[0057] Drive the extrusion shaft limiting plate stud to rotate through the extrusion shaft limiting plate stud servo motor to adjust the vertical position of the extrusion shaft limiting plate;

[0058] Drive the extrusion shaft fixing plate stud to rotate through the extrusion shaft fixing plate stud servo motor to adjust the vertical position of the extrusion shaft fixing plate, so that when the extrusion head is about to contact the battery surface, the extrusion shaft limiting plate does not affect observing the thermal runaway flame of the battery.

[0059] Step 5 S5: Extrusion test

[0060] Control the extrusion shaft fixing plate stud servo motor to drive the extrusion shaft fixing plate to press down, so that the extrusion head conducts an extrusion test on the battery;

[0061] Step 6 S6: Extrusion force value acquisition

[0062] During the test in Step 5 S5, collect the force value in the vertical direction of the extrusion shaft received by it through the extrusion shaft vertical force value sensor: collect the force value in the horizontal direction of the extrusion shaft received by it through the extrusion shaft horizontal force value sensor; collect the force value received by the battery perpendicular to the battery support plate through the support plate force value sensor;

[0063] Step 7 S7:

[0064] S7-1, Re-select the position of the battery under pressure

[0065] After the above extrusion test is completed, lift the extrusion head. If the battery is not damaged, repeat S3 to re-select the position of the battery under pressure, and repeat S4-6 to achieve multi-point testing of the battery;

[0066] And / or, S7-2, Re-adjust the tilt angle of the battery support plate

[0067] After the above extrusion test is completed, lift the extrusion head. If the battery is not damaged, repeat S2 to adjust the tilt angle of the battery support plate to different target angles, and repeat S4-6 to achieve testing of the battery at multiple tilt angles.

[0068] Preferably, during the whole process of executing steps S1-7,

[0069] Start the liquid temperature control system to circulate liquids with different temperatures to the battery support plate to achieve extrusion tests at different temperatures:

[0070] When an extrusion test at high temperature is required, the heater works to heat the liquid, and the water pump circulates the high-temperature liquid to the liquid circulation pipeline;

[0071] When an extrusion test at low temperature is required, the cooler works to cool the liquid, and the water pump circulates the low-temperature liquid to the liquid circulation pipeline.

[0072] Preferably, step S2 is executed before step S3; or, step S2 and step S3 are executed simultaneously; or, step S2 is executed after step S3.

[0073] Preferably, in step S5, the following measures are taken to control and adjust the rotation speed of the servo motor of the screw stud of the extrusion shaft fixing plate to perform an extrusion test on the battery:

[0074] By adjusting the rotation speed of the servo motor of the screw stud of the extrusion shaft fixing plate, adjust the extrusion speed to achieve extrusion at a fixed speed;

[0075] Or, by the change of the force value of the vertical force value sensor of the extrusion shaft, adjust the rotation speed of the servo motor of the screw stud of the extrusion shaft fixing plate to achieve vertical and uniform force application extrusion;

[0076] Or, by the change of the force value of the force value sensor of the support plate, adjust the rotation speed of the servo motor of the screw stud of the extrusion shaft fixing plate to achieve uniform force application extrusion on the vertical surface of the battery.

[0077] The beneficial effects of the present invention compared with the prior art are as follows:

[0078] 1. The inclination of the battery support plate in the present invention is adjustable, which can achieve multi-angle extrusion of the battery and collect the extrusion force values at multiple angles, enabling a comprehensive test of the complex forces on the battery during the inclined mechanical abuse in practice.

[0079] 2. The battery support plate in the present invention can move its position on a plane to adjust the position of the battery being extruded, enabling multi-point extrusion of the battery and achieving multi-point testing of the battery.

[0080] 3. The rotation speed of the screw servo motor of the extrusion shaft fixing plate in the present invention is adjustable, which can achieve extrusion at a fixed speed, vertical uniform force application extrusion, and uniform force application extrusion.

[0081] 4. In the present invention, due to the combined use of a liquid temperature control system, extrusion tests at different temperatures can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 is the front view of the main structure of the test device;

[0083] Figure 2 is the side view of the main structure of the test device;

[0084] Figure 3 is the schematic diagram of the bottom bracket and the inclination adjustment mechanism;

[0085] Figure 4 is the top view of the limit plate;

[0086] Figure 5 is the schematic diagram of the planar movement mechanism;

[0087] Figure 6 is the schematic diagram of the limit slider;

[0088] Figure 7 is the schematic diagram of the longitudinal movement guide rail of the positioning block of the base and the bottom bracket;

[0089] Figure 8 is the schematic diagram of the transverse movement guide rail of the positioning block of the base and the bottom bracket;

[0090] Figure 9 is the schematic diagram of the battery support flat plate and the liquid temperature control system;

[0091] Figure 10 is the schematic diagram of the positional relationship of the components related to the transverse movement in the planar movement mechanism;

[0092] Figure 11 is the schematic diagram of the battery fixing device;

[0093] Figure 12 is the axonometric drawing of the driven gear;

[0094] Figure 13This is a block diagram of an automatic control system.

[0095] 100. Battery, 101. Support plate force value sensor, 102. Battery support plate, 102-1. First battery support plate, 102-2. Second battery support plate, 103. Active gear bearing, 104-1. Longitudinal movement threaded hole, 104-2. Transverse movement threaded hole, 105. Driven gear, 1051. Mounting plane, 106. Driven gear bearing, 107. Bottom bracket, 108. Active gear, 109. Bottom bracket positioning block, 110. Clamping plate, 111. Side plate, 112. Tightening handle, 113. Screw rod, 201. Base, 202. Longitudinal movement guide rail of bottom bracket positioning block, 203. Transverse movement guide rail of bottom bracket positioning block, 204. Transverse movement stud of bottom bracket positioning block, 205. Longitudinal movement stud of bottom bracket positioning block, 206. Transverse movement servo motor of bottom bracket positioning block, 207. Longitudinal movement servo motor of bottom bracket positioning block, 300. Liquid temperature control system, 301. Pipe joint, 302. Internal pipe, 303. Liquid circulation pipe, 304. Temperature control device, 305. Support plate temperature sensor, 401. Extrusion shaft limit plate, 402. Threaded hole of extrusion shaft limit plate, 403. First light hole, 404. Linear bearing for extrusion shaft limit, 405. Horizontal force value sensor of extrusion shaft, 406. Second light hole, 407. Third light hole, 500. Limit slider, 500-1. First limit slider, 500-2. Second limit slider, 501. Positioning pulley, 502. Central axis of positioning pulley, 503. Stud limit bearing, 601. Vertical force value sensor of extrusion shaft, 602. Extrusion shaft, 603. Stud of extrusion shaft fixing plate, 604. Servo motor of bottom bracket active gear, 605. Stud of extrusion shaft limit plate, 606. Top plate, 607. Extrusion shaft fixing plate, 608. Positioning optical rod, 609. Extrusion head, 610. Servo motor of stud of extrusion shaft limit plate, 611. Servo motor of stud of extrusion shaft fixing plate, 613. Human-machine interface, 614. Data display and storage module, 615. Control computer. Detailed implementation mode

[0096] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0097] As Figure 1-2As shown, the adjustable tilt angle extrusion device for mechanical abuse testing of lithium-ion batteries includes a top plate 606, sensors, an extrusion mechanism, a battery support plate 102, a planar movement mechanism, and a tilt angle adjustment mechanism.

[0098] The sensors include: a support plate force value sensor 101 for collecting the force value of the battery in the direction perpendicular to the support plate; an extrusion shaft horizontal force value sensor 405 for collecting the force values in different horizontal directions of the extrusion shaft when extruding the battery; and an extrusion shaft vertical force value sensor 601 for collecting the vertical force value of the extrusion shaft.

[0099] The extrusion mechanism includes an extrusion shaft fixing plate 607 located below the top plate 606, which is provided with a fixing plate threaded hole, an A light hole, a B light hole, and a C light hole (the fixing plate threaded hole, A light hole, B light hole, and C light hole on the extrusion shaft fixing plate 607 are not drawn). An extrusion shaft 602 has its top fixedly connected to the extrusion shaft fixing plate 607 through the extrusion shaft vertical force value sensor 601. An extrusion shaft limiting plate 401 is located below the extrusion shaft fixing plate 607, which is provided with a threaded hole 402, a first light hole 403, a second light hole 406, and a third light hole 407. There is an opening at the center, and an extrusion shaft limiting linear bearing 404 is provided in the opening. A plurality of extrusion shaft horizontal force value sensors 405 are circumferentially and fixedly connected to the inner wall of the opening. In this embodiment, four extrusion shaft horizontal force value sensors 405 are selected. The outer peripheral wall of the extrusion shaft limiting linear bearing 404 is in movable contact with the side wall of the extrusion shaft horizontal force value sensor 405, and the extrusion shaft limiting linear bearing 404 is sleeved on the extrusion shaft 602.

[0100] An extrusion shaft fixing plate stud 603 is rotatably connected to the top plate 606 and is threadedly connected to the fixing plate threaded hole of the extrusion shaft fixing plate 607, and is passed through the first light hole 403 of the extrusion shaft limiting plate 401.

[0101] An extrusion shaft limiting plate stud 605 is rotatably connected to the top plate 606, passed through the A light hole of the extrusion shaft fixing plate 607, and is threadedly connected to the threaded hole 402 of the extrusion shaft limiting plate 401. The inner diameter of the A light hole is larger than the outer diameter of the extrusion shaft limiting plate stud 605, and the extrusion shaft limiting plate stud 605 passes through it, so that the extrusion shaft limiting plate stud 605 can freely rotate to drive the extrusion shaft limiting plate 401 to move vertically without affecting the extrusion shaft fixing plate 607.

[0102] Two positioning optical rods 608 are fixedly connected to the base 201 and the top plate 606. One of them is passed through the second light hole 406 of the extrusion shaft limiting plate 401 and the B light hole of the extrusion shaft fixing plate 607, and the other is passed through the third light hole 407 of the extrusion shaft limiting plate 401 and the C light hole of the extrusion shaft fixing plate 607.

[0103] The extrusion shaft limit plate stud servo motor 610 is installed under the base 201 and is used to drive the rotation of the extrusion shaft limit plate stud 605. The rotation speed of the extrusion shaft limit plate stud servo motor 610 is adjustable.

[0104] The extrusion shaft fixing plate stud servo motor 611 is installed under the base 201 and is used to drive the rotation of the extrusion shaft fixing plate stud 603. The rotation speed of the extrusion shaft fixing plate stud servo motor 611 is adjustable.

[0105] For the extrusion shaft limit plate 401, please refer to Figure 4 , there are extrusion shaft limit plate threaded holes 402 on the extrusion shaft limit plate 401. The extrusion shaft limit plate stud 605 meshes with this threaded hole. The extrusion shaft limit plate stud servo motor 610 drives the extrusion shaft limit plate 401 to move up and down by rotating the extrusion shaft limit plate stud 605; in addition, a first light hole 403, a second light hole 406 and a third light hole 407 are provided on the extrusion shaft limit plate 401. Two positioning optical rods 608 fixed on the base 201 respectively pass through the second light hole 406 and the third light hole 407 to keep the extrusion shaft limit plate 401 horizontal during the vertical movement. The first light hole 403 is used to pass through the extrusion shaft fixing plate stud 603. The diameter of the first light hole 403 is larger than that of the extrusion shaft fixing plate stud 603. Therefore, during the vertical movement of the extrusion shaft fixing plate 607 driven by the rotation of the extrusion shaft fixing plate stud 603, it will not affect the extrusion shaft limit plate 401, and the independent movement of the extrusion shaft limit plate 401 and the extrusion shaft fixing plate 607 can be realized; similarly, there is a fixing plate threaded hole at the position corresponding to the first light hole 403 on the extrusion shaft fixing plate 607. The extrusion shaft fixing plate stud 603 is connected in cooperation with the fixing plate threaded hole. The extrusion shaft fixing plate stud servo motor 611 drives the extrusion shaft fixing plate 607 to move up and down by rotating the extrusion shaft fixing plate stud 603.

[0106] Figure 1 is the main structural view of the device. The extrusion shaft limit plate stud 605 is blocked by the extrusion shaft fixing plate stud 603, and the extrusion shaft limit plate stud servo motor 610 is blocked by the extrusion shaft fixing plate stud servo motor 611. Therefore, the indication lines of the extrusion shaft limit plate stud 605 and the extrusion shaft limit plate stud servo motor 610 are in dotted lines. Figure 2 is the side structural view of the device. The extrusion shaft limit plate stud 605 is blocked by the positioning optical rod 608. Therefore, the indication line of the extrusion shaft limit plate stud 605 is in dotted lines.

[0107] Please refer to Figure 3 , the battery support plate 102 includes a first battery support plate 102-1 and a second battery support plate 102-2 that are parallel to each other. The support plate force value sensor 101 is arranged between the first battery support plate 102-1 and the second battery support plate 102-2.

[0108] Please refer to Figure 3 、 5 -7 and 10. The planar moving mechanism includes a base 201, on which there are a longitudinal movement guide rail 202 for the bottom bracket positioning block and a transverse movement guide rail 203 for the bottom bracket positioning block;

[0109] a transverse movement servo motor 206 for the bottom bracket positioning block;

[0110] a longitudinal movement servo motor 207 for the bottom bracket positioning block;

[0111] a bottom bracket positioning block 109, which is provided with a longitudinal movement threaded hole 104-1 and a transverse movement threaded hole 104-2, Figure 3 Two of the dashed lines in [[ ]] represent the invisible transverse movement threaded hole 104-2.

[0112] A limit slider 500 includes a first limit slider 500-1 and a second limit slider 500-2 with the same structure. The first limit slider 500-1 is slidably connected to the transverse movement guide rail 203 of the bottom bracket positioning block, and the second limit slider 500-2 is slidably connected to the longitudinal movement guide rail 202 of the bottom bracket positioning block.

[0113] A positioning pulley central shaft 502 is provided on the limit slider 500. A positioning pulley 501 is rotatably connected to the positioning pulley central shaft 502. Sliding grooves matching the positioning pulley 501 are opened on the outer sides of the longitudinal movement guide rail 202 and the transverse movement guide rail 203 of the bottom bracket positioning block.

[0114] As Figure 6 shown, a positioning pulley 501 is provided on the limit slider 500. The positioning pulley 501 is connected to the limit slider 500 through the positioning pulley central shaft 502, so that the positioning pulley 501 can rotate. Sliding grooves matching the positioning pulley 501 are opened on the upper and lower outer end faces of the movement guide rail on the base, so that the pulley can rotate in the groove to make the movement of the bottom bracket positioning block 109 smoother.

[0115] As Figure 10 shown, taking the transverse movement as an example, a pair of transverse movement studs 204 for the bottom bracket positioning block are connected to the first limit slider 500-1. The first limit slider 500-1 is used to ensure the linearity of the bottom bracket positioning block 109 during the movement. The transverse movement studs 204 for the bottom bracket positioning block are connected to the first limit slider 500-1 through stud limit bearings 503, so that the threaded shaft can rotate freely. As Figure 7-8 shown, on the base 201, there are a longitudinal movement guide rail 202 for the bottom bracket positioning block and a transverse movement guide rail 203 for the bottom bracket positioning block for fixing the linear movement of the limit slider.

[0116] The lateral movement stud 204 of the bottom bracket positioning block is threadedly connected to the lateral movement threaded hole 104-2. One end thereof is rotatably connected to the first limit slider 500-1 through the stud limit bearing 503, and the other end is fixedly connected to the rotating shaft of the lateral movement servo motor 206 of the bottom bracket positioning block.

[0117] The longitudinal movement stud 205 of the bottom bracket positioning block is threadedly connected to the longitudinal movement threaded hole 104-1. One end thereof is rotatably connected to the second limit slider 500-2 through the stud limit bearing 503, and the other end is fixedly connected to the rotating shaft of the longitudinal movement servo motor 207 of the bottom bracket positioning block.

[0118] As Figure 5 shown, the number of the lateral movement stud 204 of the bottom bracket positioning block and the lateral movement threaded hole 104-2, and the number of the longitudinal movement stud 205 of the bottom bracket positioning block and the longitudinal movement threaded hole 104-1 are matched.

[0119] In this embodiment, in order to increase the stability of the bottom bracket positioning block 109 during movement, the lateral movement stud 204 of the bottom bracket positioning block, the lateral movement threaded hole 104-2, the longitudinal movement stud 205 of the bottom bracket positioning block and the longitudinal movement threaded hole 104-1 all adopt a paired form, and two are taken respectively.

[0120] Please refer to Figure 2 、 3 and 13, the inclination adjustment mechanism includes:

[0121] The bottom bracket 107, which is fixedly connected to the bottom bracket positioning block 109;

[0122] The driving gear 108, which is fixedly connected to the central shaft of the driving gear 108. The central shaft of the driving gear 108 is fixedly connected to the driving gear bearing 103, and is rotatably connected to the bottom bracket 107 through the driving gear bearing 103.

[0123] The driven gear 105, which is fixedly connected to the central shaft of the driven gear. The central shaft of the driven gear is rotatably connected to the bottom bracket 107 through the driven gear bearing 106, and the driven gear 105 is meshed and connected with the driving gear 108. A part of the outer side surface of the driven gear 105 is cut off by a plane parallel to the central shaft of the driven gear to form a mounting plane 1051. The driven gear 105 is fixedly connected to the battery support plate 102 through the mounting plane 1051. Figure 12 Fig. is the axonometric view of the driven gear. The rectangular plane at the upper part of the driven gear 105 in the figure is the mounting plane 1051.

[0124] On the axial end face of the driven gear 105, an inclination angle scale (not shown) is provided. The bottom bracket driving gear servo motor 604 is manually started, and it is shut down when the inclination angle reaches the target angle. It is also possible to perform centralized automatic control on the inclination angle, etc. The scheme for automatic control is described in Embodiment 3.

[0125] The bottom bracket driving gear servo motor 604 has its rotating shaft fixedly connected to the central axis of the driving gear 108, and is used to drive the driving gear 108 to rotate, thereby adjusting the inclination angle of the battery support plate 102.

[0126] Please refer to Figure 11 , in order to prevent the battery from slipping on the battery support plate 102 when the battery support plate 102 is tilted, a battery fixing device is symmetrically arranged on the battery support plate 102, including: a clamping plate 110, side plates 111, a tightening handle 112, and a screw 113. The side plates 111 are fixedly connected to the left and right sides of the first battery support plate 102-1 on the upper layer of the battery support plate 102. Threaded holes are provided on the side plates 111, and the screw 113 is threadedly connected to the side plates 111 through the threaded holes. The clamping plate 110 is slidably connected to the first battery support plate 102-1. A rotating bearing is provided on the clamping plate 110. One end of the screw 113 is rotatably connected to the clamping plate 110 through the rotating bearing. The tightening handle 112 is fixedly connected to the other end of the screw 113. The heights of the clamping plate 110 and the side plates 111 are both lower than the thickness of the battery 100, so as to avoid the pressing head 609 touching the clamping plate 110 and the side plates 111 when pressing the battery.

[0127] What the present invention calls fixing the battery means that when the support plate 102 is tilted, the battery 100 placed on the support plate 102 does not slip.

[0128] The method for fixing the battery is: the battery 100 is placed between the two clamping plates 110 of the first battery support plate 102-1. The tightening handles 112 on both sides are manually tightened. The screw 113 pushes the two clamping plates 110 to gradually approach and clamp the battery 100, so that the battery 100 does not slip when the support plate 102 is tilted. The process of releasing the fixed battery is opposite to the fixing process. Embodiment 2

[0129] The battery may be in different ambient temperatures during actual use.

[0130] Please refer to Figure 9 , the liquid temperature control system 300 is used to circulate liquids of different temperatures to the battery support plate 102.

[0131] It includes: an internal pipeline 302, which is arranged inside the first battery support plate 102-1 on the upper layer of the battery support plate 102.

[0132] The liquid circulation pipeline 303 is connected to the internal pipeline 302 through a pipeline joint 301 at one end and to the temperature control device 304 at the other end;

[0133] The temperature control device 304 is used to maintain the battery temperature and can be set according to needs in specific use. It includes a water pump, a heater, and a cooler. After the external liquid is heated by the heater or cooled by the cooler, it is circulated and transported to the liquid circulation pipeline 303 by the water pump.

[0134] The liquid is anhydrous alcohol or silicone oil or water. The heater and the cooler are equipped with temperature adjustment switches. The operator can adjust the liquid temperature according to the target temperature. After the battery temperature is consistent with the target temperature, multi-angle extrusion tests can be carried out at the target temperature; or after the previous test is completed, the external liquid temperature can be changed to achieve extrusion tests at different temperatures.

[0135] For centralized automatic control, a support plate temperature sensor 305 is also provided inside the first battery support plate 102-1 on the upper plate of the battery support plate 102 to collect the temperature signal of the support plate 102. After being processed by the control computer 615, a control signal is output to control the temperature adjustment switches of the heater and the cooler. The automatic control scheme is described in Embodiment 3. Embodiment 3

[0136] Using the above adjustable tilt angle extrusion device for mechanical abuse testing of lithium-ion batteries, the battery mechanical abuse testing method includes the following specific steps:

[0137] Step 1 S1: Fix the battery

[0138] Fix the battery on the first battery support plate 102-1;

[0139] Step 2 S2: Adjust the tilt angle of the battery support plate

[0140] Adjust the tilt angle of the battery support plate 102 to the target angle through the bottom bracket drive gear servo motor 604;

[0141] Step 3 S3: Adjust the position on the plane of the bottom bracket positioning block

[0142] Adjust the position of the bottom bracket positioning block 109 on the plane through the bottom bracket positioning block lateral movement servo motor 206 and the bottom bracket positioning block longitudinal movement servo motor 207, so as to adjust the position of the battery being extruded;

[0143] Step 4 S4: Adjust the vertical positions of the extrusion shaft fixing plate 607 and the extrusion shaft limiting plate 401

[0144] Drive the extrusion shaft limiting plate stud 605 to rotate through the extrusion shaft limiting plate stud servo motor 610 to adjust the vertical position of the extrusion shaft limiting plate 401;

[0145] The extrusion shaft fixing plate stud 603 is driven to rotate by the extrusion shaft fixing plate stud servo motor 611, and the vertical position of the extrusion shaft fixing plate 607 is adjusted so that when the extrusion head 609 is about to contact the battery surface, the extrusion shaft limit plate 401 does not affect the observation of the thermal runaway flame of the battery;

[0146] Step 5 S5: Extrusion test

[0147] Control the extrusion shaft fixing plate stud servo motor 611 to drive the extrusion shaft fixing plate 607 to press down, so that the extrusion head 609 performs an extrusion test on the battery;

[0148] Step 6 S6: Collection of extrusion force values

[0149] During the step 5 S5 test,

[0150] The force value in the vertical direction of the extrusion axis is collected by the extrusion axis vertical force sensor 601:

[0151] The horizontal force value of the extrusion axis is collected by the extrusion axis horizontal force value sensor 405;

[0152] The force value of the battery perpendicular to the battery support plate 102 is collected through the support plate force sensor 101;

[0153] Step 7 S7:

[0154] S7-1, reselect the pressure position of the battery

[0155] After the above extrusion test is completed, the extrusion head 609 is lifted up, and if the battery does not catch fire or explode, S3 is repeated, the compressed position of the battery is reselected, and S4-6 are repeated to achieve multi-point testing of the battery;

[0156] And / or, S7-2, readjust the tilt angle of the battery support plate

[0157] After the above extrusion test is completed, the extrusion head 609 is lifted up, and if the battery is not damaged, S2 is repeated to adjust the inclination angle of the battery support plate 102 to different target angles, and S4-6 are repeated to achieve multi-inclination angle testing of the battery.

[0158] Among them, in the whole process of executing steps S1-7,

[0159] The liquid temperature control system 300 is started to circulate liquids of different temperatures to the battery support plate 102 to implement extrusion tests at different temperatures:

[0160] Both the heater and the cooler are equipped with temperature control switches to control the heating or cooling temperature.

[0161] When extrusion testing is required at high temperatures, set the heating temperature of the temperature control switch according to the target temperature. The heater operates to heat the liquid, and the water pump circulates and transports the high-temperature liquid to the liquid circulation pipeline 303.

[0162] When extrusion testing is required at low temperatures, set the cooling temperature of the temperature control switch according to the target temperature. The cooler operates to cool the liquid, and the water pump circulates and transports the low-temperature liquid to the liquid circulation pipeline 303.

[0163] Among them, step S2 is executed before step S3; or, step S2 and step S3 are executed simultaneously; or, step S2 is executed after step S3.

[0164] Among them, in step S5, the following measures are taken to control and adjust the rotation speed of the servo motor 611 of the extrusion shaft fixing plate stud to conduct extrusion testing on the battery:

[0165] By adjusting the rotation speed of the servo motor 611 of the extrusion shaft fixing plate stud, the extrusion speed is adjusted to achieve extrusion at a fixed speed. Specifically, the rotation speed of the servo motor 611 of the extrusion shaft fixing plate stud is adjusted using a speed control switch to obtain different fixed speeds, or its rotation speed can also be automatically controlled and adjusted.

[0166] Please refer to Figure 13 , Figure 13 which is the block diagram of the automatic control system. To improve the automation level of the present invention, computer control is adopted: 1. The tilt angle of the battery support plate 102; 2. The rotation speed of the servo motor 611 of the extrusion shaft fixing plate stud; 3. The start, stop, and temperature adjustment of the heater and cooler; 4. The start and stop of the servo motor 206 for the lateral movement of the bottom bracket positioning block; 5. The start and stop of the servo motor 207 for the longitudinal movement of the bottom bracket positioning block; 6. The start and stop of the servo motor 610 of the extrusion shaft limit plate stud.

[0167] The automatic control system includes a control computer 615, a human-machine interface 613, a data display and storage module 614, a sensor signal input interface, a motor control signal output interface, and a liquid temperature control system control signal output interface.

[0168] The signal output ends of the support plate force sensor 101, the support plate temperature sensor 305, the extrusion shaft horizontal force sensor 405, the extrusion shaft vertical force sensor 601, and the tilt angle sensor 612 are respectively connected to the corresponding input ends of the sensor signal input interface.

[0169] The control signal input terminals of the bottom bracket positioning block transverse movement servo motor 206, the bottom bracket positioning block longitudinal movement servo motor 207, the extrusion shaft limit plate stud servo motor 610, the bottom bracket driving gear servo motor 604, and the extrusion shaft fixing plate stud servo motor 611 are respectively connected to the corresponding output terminals of the motor control signal output interface.

[0170] The control computer 615 is used to process the sensor information and display the test data in real time through the data display and storage module 614, and store the test information at the same time.

[0171] When adjusting the battery position, after the operator inputs the battery target position parameters through the human-machine interface 613, the control computer 615 issues an instruction according to the input position parameters and the existing position, controls the bottom bracket positioning block transverse movement servo motor 206 and the bottom bracket positioning block longitudinal movement servo motor 207 to start and move the corresponding distance, so as to achieve the purpose of adjusting the battery position.

[0172] When adjusting the tilt angle of the battery support plate 102, the operator inputs the target tilt angle through the human-machine interface 613. The control computer 615 calculates the difference from the target tilt angle according to the tilt angle of the existing battery support plate 102 detected by the tilt angle sensor 612, controls the bottom bracket driving gear servo motor 604 to adjust the tilt angle of the battery support plate 102, and the tilt angle sensor 612 continues to detect the tilt angle of the battery support plate 102. When the target tilt angle is reached, the bottom bracket driving gear servo motor 604 is turned off.

[0173] When adjusting the temperature of the battery support plate 102, the operator inputs the target temperature through the human-machine interface 613. The control computer 615 calculates the difference from the target temperature according to the temperature of the existing battery support plate 102 detected by the support plate temperature sensor 305, controls the heater and cooler of the liquid temperature control system 300 to adjust the temperature, and the support plate temperature sensor 305 continues to detect the temperature of the battery support plate 102. When the target temperature is reached, the temperature adjustment is stopped to achieve the purpose of temperature control.

[0174] There are three ways to adjust the rotation speed of the extrusion shaft fixing plate stud servo motor 611: during the extrusion process, the control computer can adjust the rotation speed of the extrusion shaft fixing plate stud servo motor 611 according to the data of the extrusion shaft vertical force value sensor 601 to achieve uniform extrusion in the vertical direction; it can also control the extrusion shaft fixing plate stud servo motor 611 at a fixed rotation speed to achieve uniform extrusion; it can also adjust the rotation speed of the extrusion shaft fixing plate stud servo motor 611 according to the data of the support plate force value sensor 101 to achieve uniform extrusion in the direction perpendicular to the battery.

[0175] Meanwhile, the force values of the support plate force sensor 101, the horizontal force sensor 405 of the extrusion shaft, the vertical force sensor 601 of the extrusion shaft, and the displacement of the extrusion head 609 are displayed and stored in the data display and storage module 614.

Claims

1. An adjustable tilt angle extrusion device for mechanical abuse testing of lithium-ion batteries, characterized in that: include Top plate (606); The sensor is used to collect the extrusion force values ​​in the vertical direction, the horizontal direction and the direction perpendicular to the inclined surface; A squeezing mechanism for squeezing the battery; A battery support plate (102), used for fixing the battery; A plane moving mechanism, used to enable the battery support plate (102) to move laterally and / or longitudinally on a plane; The inclination adjustment mechanism is used to adjust the inclination of the battery to achieve squeezing of the battery at different inclinations; Sensors, including: A support plate force sensor (101), used to collect the force value exerted on the battery in a direction perpendicular to the support plate; The extrusion axis horizontal force sensor (405) is used to collect the horizontal force values ​​of the extrusion axis in different directions when the battery is extruded; The extrusion axis vertical force sensor (601) is used to collect the vertical force value of the extrusion axis; Extrusion mechanism, comprising: The extrusion shaft fixing plate (607) is located below the top plate (606) and is provided with a fixing plate threaded hole, an A optical hole, a B optical hole and a C optical hole; An extrusion shaft (602), the top end of which is fixedly connected to an extrusion shaft fixing plate (607) via an extrusion shaft vertical force sensor (601); An extrusion shaft limiting plate (401) is located below the extrusion shaft fixing plate (607), and is provided with a threaded hole (402), a first light hole (403), a second light hole (406), and a third light hole (407). An opening is provided at the center, and an extrusion shaft limiting linear bearing (404) is provided in the opening. A plurality of extrusion shaft horizontal force sensors (405) are evenly distributed and fixedly connected to the hole wall of the opening in the circumferential direction. The outer peripheral wall of the extrusion shaft limiting linear bearing (404) is movably abutted against the side wall of the extrusion shaft horizontal force sensor (405), and the extrusion shaft limiting linear bearing (404) is sleeved on the extrusion shaft (602); An extrusion shaft fixing plate stud (603) is rotatably connected to the top plate (606), is threadedly connected to the fixing plate threaded hole of the extrusion shaft fixing plate (607), and is inserted into the first light hole (403) of the extrusion shaft limiting plate (401); The extrusion shaft limit plate stud (605) is rotatably connected to the top plate (606), is inserted into the A optical hole of the extrusion shaft fixing plate (607), and is threadedly connected to the threaded hole (402) of the extrusion shaft limit plate (401); Two positioning light rods (608) are fixedly connected to the base (201) and the top plate (606), one of which is inserted into the second light hole (406) of the extrusion shaft limit plate (401) and the light hole B of the extrusion shaft fixing plate (607), and the other is inserted into the third light hole (407) of the extrusion shaft limit plate (401) and the light hole C of the extrusion shaft fixing plate (607); The extrusion shaft limit plate stud servo motor (610) is installed under the base (201) and is used to drive the extrusion shaft limit plate stud (605) to rotate. The speed of the extrusion shaft limit plate stud servo motor (610) is adjustable; The extrusion shaft fixing plate stud servo motor (611) is installed under the base (201) and is used to drive the extrusion shaft fixing plate stud (603) to rotate. The speed of the extrusion shaft fixing plate stud servo motor (611) is adjustable.

2. The adjustable tilt angle extrusion device for mechanical abuse testing of lithium-ion batteries according to claim 1, characterized in that: A battery support plate (102), comprising a first battery support plate (102-1) and a second battery support plate (102-2) which are parallel to each other, wherein the support plate force sensor (101) is arranged between the first battery support plate (102-1) and the second battery support plate (102-2); Planar moving mechanism, including A base (201), the base (201) being provided with a bottom bracket positioning block longitudinal motion guide rail (202) and a bottom bracket positioning block lateral motion guide rail (203); Bottom bracket positioning block lateral motion servo motor (206); Bottom bracket positioning block longitudinal motion servo motor (207); The bottom bracket positioning block (109) is provided with a longitudinal movement threaded hole (104-1) and a transverse movement threaded hole (104-2); The limiting slider (500) comprises a first limiting slider (500-1) and a second limiting slider (500-2) of the same structure, wherein the first limiting slider (500-1) is slidably connected to a lateral motion guide rail (203) of a bottom bracket positioning block, and the second limiting slider (500-2) is slidably connected to a longitudinal motion guide rail (202) of a bottom bracket positioning block; The bottom bracket positioning block transverse movement stud (204) is threadedly connected to the transverse movement threaded hole (104-2), one end of which is rotationally connected to the first limit slider (500-1) via a stud limit bearing (503), and the other end is fixedly connected to the rotating shaft of the bottom bracket positioning block transverse movement servo motor (206); The bottom bracket positioning block longitudinal movement stud (205) is threadedly connected to the longitudinal movement threaded hole (104-1), one end of which is rotationally connected to the second limit slider (500-2) via a stud limit bearing (503), and the other end is fixedly connected to the rotating shaft of the bottom bracket positioning block longitudinal movement servo motor (207); The tilt adjustment mechanism comprises: A bottom bracket (107) fixedly connected to a bottom bracket positioning block (109); A driving gear (108) is fixedly connected to the central axis of the driving gear (108), the central axis of the driving gear (108) is fixedly connected to the driving gear bearing (103), and is rotatably connected to the bottom bracket (107) through the driving gear bearing (103); The driven gear (105) is fixedly connected to the central axis of the driven gear. The central axis of the driven gear is rotatably connected to the bottom bracket (107) through the driven gear bearing (106). The driven gear (105) and the driving gear (108) are meshed and connected with each other. A portion of the outer side surface of the driven gear (105) is cut off by a plane parallel to the central axis of the driven gear to form a mounting plane (1051). The driven gear (105) is fixedly connected to the battery support plate (102) through the mounting plane. The bottom bracket driving gear servo motor (604) has a rotating shaft fixedly connected to the central axis of the driving gear (108) and is used to drive the driving gear (108) to rotate.

3. The adjustable tilt angle extrusion device for mechanical abuse testing of lithium-ion batteries according to claim 2, characterized in that: A positioning pulley center axis (502) is arranged on the limiting slider (500), the positioning pulley center axis (502) is rotatably connected to the positioning pulley (501), and a sliding groove matching the positioning pulley (501) is provided on the outer side of the bottom bracket positioning block longitudinal motion guide rail (202) and the bottom bracket positioning block transverse motion guide rail (203).

4. The adjustable tilt angle extrusion device for mechanical abuse testing of lithium-ion batteries according to claim 3, characterized in that: The numbers of the transverse movement studs (204) and the transverse movement threaded holes (104-2) of the bottom bracket positioning block, and the numbers of the longitudinal movement studs (205) and the longitudinal movement threaded holes (104-1) of the bottom bracket positioning block match.

5. The adjustable tilt angle extrusion device for mechanical abuse testing of lithium-ion batteries according to claim 4, characterized in that: It also includes a liquid temperature control system (300) for circulating and delivering liquids of different temperatures to the battery support plate (102); The liquid temperature control system comprises: An internal pipe (302) is arranged inside a first battery support plate (102-1) of an upper layer of the battery support plate (102); A liquid circulation pipeline (303), one end of which is connected to the internal pipeline (302) via a pipeline joint (301), and the other end of which is connected to the temperature control device (304); The temperature control device (304) includes a water pump, a heater and a cooler. After the external liquid is heated by the heater or cooled by the cooler, it is circulated and transported to the liquid circulation pipeline (303) by the water pump.

6. A test method for the adjustable tilt angle extrusion device for mechanical abuse testing of lithium-ion batteries according to claim 5, characterized in that: Battery mechanical abuse test method, including the following steps: Step 1 S1: Fix the battery: Fixing the battery on the first battery support plate (102-1); Step 2 S2: Adjust the tilt angle of the battery support plate: The tilt angle of the battery support plate (102) is adjusted to a target angle by means of a bottom bracket driving gear servo motor (604); Step 3 S3: Adjust the position of the bottom bracket positioning block on the plane: The position of the bottom bracket positioning block (109) on the plane is adjusted by a bottom bracket positioning block lateral motion servo motor (206) and a bottom bracket positioning block longitudinal motion servo motor (207), thereby adjusting the squeezed position of the battery; Step 4 S4: Adjust the vertical position of the extrusion shaft fixing plate (607) and the extrusion shaft limiting plate (401): The extrusion shaft limit plate stud (605) is driven to rotate by the extrusion shaft limit plate stud servo motor (610) to adjust the vertical position of the extrusion shaft limit plate (401); The extrusion shaft fixing plate stud servo motor (611) is used to drive the extrusion shaft fixing plate stud (603) to rotate, and the vertical position of the extrusion shaft fixing plate (607) is adjusted so that when the extrusion head (609) is about to contact the battery surface, the extrusion shaft limit plate (401) does not affect the observation of the thermal runaway flame of the battery; Step 5 S5: Extrusion test: Controlling the extrusion shaft fixing plate stud servo motor (611) to drive the extrusion shaft fixing plate (607) to press downward, so that the extrusion head (609) performs an extrusion test on the battery; Step 6 S6: Collection of extrusion force value: During the step 5 S5 test, The force value in the vertical direction of the extrusion axis is collected by the extrusion axis vertical force sensor (601): The force value in the horizontal direction of the extrusion axis is collected by an extrusion axis horizontal force value sensor (405); The force value applied to the battery in a direction perpendicular to the battery support plate (102) is collected through a support plate force value sensor (101); Step 7 S7: S7-1, reselect the pressure position of the battery: After the above extrusion test is completed, the extrusion head (609) is lifted up, and if the battery is not damaged, S3 is repeated, the pressure position of the battery is reselected, and S4-6 are repeated to achieve multi-point testing of the battery; And / or, S7-2, readjust the tilt angle of the battery support plate: After the above extrusion test is completed, the extrusion head (609) is raised, and if the battery is not damaged, S2 is repeated to adjust the inclination angle of the battery support plate (102) to different target angles, and S4-6 are repeated to achieve multi-inclination angle testing of the battery.

7. The testing method of the adjustable tilt angle extrusion device for mechanical abuse testing of lithium-ion batteries according to claim 6, characterized in that: During the entire process of executing steps S1-7, the liquid temperature control system (300) is started to circulate liquids of different temperatures to the battery support plate (102) to implement extrusion tests at different temperatures: When an extrusion test is required at a high temperature, the heater is operated to heat the liquid, and the water pump circulates the high-temperature liquid to the liquid circulation pipeline (303); When extrusion testing is required at low temperature, the cooling machine operates to cool the liquid, and the water pump circulates the low-temperature liquid to the liquid circulation pipeline (303).

8. The testing method of the adjustable tilt angle extrusion device for mechanical abuse testing of lithium-ion batteries according to claim 6, characterized in that: Step S2 is executed before step S3; or, step S2 and step S3 are executed simultaneously; or, step S2 is executed after step S3.

9. The testing method of the adjustable tilt angle extrusion device for mechanical abuse testing of lithium-ion batteries according to claim 6, characterized in that: In step S5, the following measures are taken to control and adjust the rotation speed of the extrusion shaft fixing plate stud servo motor (611) to perform an extrusion test on the battery: By adjusting the rotation speed of the extrusion shaft fixing plate stud servo motor (611), the extrusion speed is adjusted to achieve fixed speed extrusion; Alternatively, the rotation speed of the extrusion shaft fixing plate stud servo motor (611) is adjusted by the force value change of the extrusion shaft vertical force value sensor (601), so as to achieve vertical uniform force extrusion; Alternatively, the rotation speed of the extrusion shaft fixing plate stud servo motor (611) is adjusted by the force value change of the support plate force value sensor (101), so as to achieve uniform force extrusion perpendicular to the battery surface.

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