A battery case strength testing device

Abstract

The application relates to the technical field of strength testing, and discloses a storage battery shell strength testing device which comprises a hydraulic feeding mechanism and an electromagnetic pressure control mechanism, and the structure comprises a horizontal hollow shell body fixedly installed at the periphery of a No.1 butt joint channel and internally provided with a hollow structure, an internal valve plate placed in the horizontal hollow shell body and capable of controlling the liquid flow state, and an electromagnet installed on the horizontal hollow shell body and capable of controlling the motion resistance of the internal valve plate. The storage battery shell strength testing device uses liquid pressure to detect the strength of the storage battery shell, thereby reducing the requirement of the equipment on the use space, and the device has the characteristics of stable detection process. In addition, the device uses the electromagnet to control the strength of the equipment impact, has the stepless adjustment function, thereby expanding the effective detection range of the equipment in the strength detection aspect, and improving the detection precision of the equipment.

Description

Technical Field

[0001] This invention relates to the field of strength testing technology, specifically to a battery casing strength testing device. Background Technology

[0002] Currently, both domestic and international battery industries continue to use traditional plastic casings for lead-acid batteries, typically PP or ABS. The strength of the battery casing is crucial, directly impacting the battery's lifespan. Insufficient battery strength can lead to brittleness, electrolyte leakage, and direct battery damage. Therefore, after manufacturing battery casings, strength testing is essential, usually using impact testing. However, current testing methods are largely manual, involving the use of steel balls. This method is highly susceptible to human error, with slight variations in the landing point and angle of impact, resulting in significant testing errors.

[0003] To this end, Chinese Patent Publication No. CN211292404U discloses a "Battery Casing Strength Testing Device". Its main structure includes a base and a longitudinal frame. A casing fixing device is mounted on the base. A transverse frame is mounted on the longitudinal frame. A rotating frame is mounted below the transverse frame, facing the casing fixing device. The rotating frame is rotatably mounted on the transverse frame. A driving device is mounted on the transverse frame, driving the rotating frame to rotate. An electromagnet is mounted on the rotating frame, and an iron ball is attracted to the electromagnet. A controller is mounted on the transverse frame, connected to the electromagnet and controlling its energization and de-energization. This battery casing strength testing device allows for adjustment of the height and the size of the iron ball, effectively fixing the battery casing. It then directly controls a designated iron ball to fall freely and impact the battery casing. Testing is performed according to fixed parameters, resulting in small errors and improved testing efficiency.

[0004] However, in actual testing, the impact strength is adjusted by using iron balls of different radii and their heights. Obviously, this requires the use of multiple iron balls with different radii (to ensure selectivity of impact strength). Therefore, it is necessary to increase the variety of components, which will increase manufacturing costs. Furthermore, there are gravitational gaps between iron balls of different radii, making stepless strength adjustment impossible. In addition, the height of the iron balls also needs to be adjusted, which inevitably requires the introduction of a vertical height adjustment mechanism. This results in a larger space occupied by the equipment during operation, higher requirements for the place of use, and greater limitations in its use. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a battery casing strength testing device that utilizes liquid pressure to test the strength of the battery casing, thereby reducing the space requirements for the equipment and providing a stable testing process. Furthermore, the device uses an electromagnet to control the impact intensity of the equipment, providing stepless adjustment functionality, thus improving the effective testing range and accuracy of the equipment in strength testing, and solving the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a battery casing strength testing device, comprising a workbench that provides support, a first fixing sleeve with a first connecting plate mounted on one side, and an impact head capable of impacting the battery casing; a hydraulic supply mechanism, the structure of which includes a hollow hydraulic cylinder fixedly installed in the first fixing sleeve and having a hollow internal structure, a first docking channel capable of introducing liquid into the hollow hydraulic cylinder, a first piston plate placed inside the hollow hydraulic cylinder and capable of moving downward under liquid pressure, and a longitudinal telescopic rod that moves with the first piston plate and can drive the impact head to move; and an electromagnetic pressure control mechanism, the structure of which includes a hollow horizontal shell fixedly installed around the first docking channel and having a hollow internal structure, an internal valve plate placed inside the hollow horizontal shell and capable of controlling the liquid flow state, and an electromagnet installed in the hollow horizontal shell and capable of controlling the movement resistance of the internal valve plate.

[0007] Preferably, the hydraulic supply mechanism further includes a first component movable cavity disposed inside the hydraulic hollow cylinder. The bottom end of the hydraulic hollow cylinder is provided with a first rod through hole connecting the space below it and the bottom end of the first component movable cavity. The top end of the hydraulic hollow cylinder is provided with a first docking channel integrally formed with it. The interior of the first docking channel is provided with a liquid injection hole connecting the space above it and the top end of the first component movable cavity. The middle part of the first docking channel is provided with a first liquid hole connecting the external space and the liquid injection hole. The interior of the first component movable cavity is provided with a first piston plate capable of moving along its axial direction. The bottom end of the first piston plate is fixedly installed with a longitudinal telescopic rod passing through the first rod through hole. The longitudinal telescopic rod is surrounded by a first helical spring in a compressed state on the outside of the rod body located inside the first component movable cavity. The bottom end of the longitudinal telescopic rod is fixedly installed with a second connecting plate. The bottom end of the second connecting plate is fixedly connected to the mounting end of the impact head.

[0008] Preferably, the structural shape of the perforated cross section of the first rod is consistent with the structural shape of the cross section of the longitudinal telescopic rod, both being polygonal structures, and the structural dimensions of the perforated cross section of the first rod match the structural dimensions of the cross section of the longitudinal telescopic rod.

[0009] Preferably, the electromagnetic pressure control mechanism further includes a second fixing sleeve integrally disposed at one end of the horizontal hollow shell. The second fixing sleeve has a shell fixing cavity fixedly fitted onto the circumferential side of the first docking channel. A liquid flow annular cavity is disposed around the central region of the shell fixing cavity on the second fixing sleeve. A second component movable cavity is disposed inside the horizontal hollow shell. One end of the second component movable cavity is connected to one side of the liquid flow annular cavity via a second liquid hole. The other end of the horizontal hollow shell has a second docking channel connecting to the other end of the second component movable cavity. The movable cavity of component number one has an internal valve plate that can move axially along the movable cavity of component number two on the side near the liquid hole number two. The outer circumferential surface of the internal valve plate has multiple concave liquid flow grooves. A permanent magnet is embedded in the end of the internal valve plate away from the liquid hole number two. The horizontal hollow shell has an internal fixing frame installed in the middle of the shell fixing cavity. An electromagnetic fixing cavity with open ends is set at the center of the internal fixing frame. An electromagnet is fixedly installed in the electromagnetic fixing cavity. The internal fixing frame and the horizontal hollow shell have wire mounting holes for placing the electromagnet wire.

[0010] Preferably, the centerline of the electromagnet and the centerline of the permanent magnet are on the same straight line, and this straight line coincides with the centerline of the built-in valve plate.

[0011] Preferably, during operation, the electromagnet's wire is connected to the output end of a current controller that can control the magnitude and direction of the current, and the current output by the current controller causes the electromagnet to generate a repulsive force on the permanent magnet.

[0012] Preferably, it also includes an angle-controllable support mechanism, the structure of which includes a longitudinal hollow shell fixedly installed on the upper surface of the workbench and having a hollow internal structure, a rotating column that can rotate with the first connecting plate, a second piston plate placed inside the longitudinal hollow shell and capable of moving upward under liquid pressure, and a locking rod that moves with the second piston plate and can lock the rotating column.

[0013] Preferably, the angle-controllable support mechanism further includes a third connecting plate disposed at the bottom of the longitudinal hollow shell and fixedly mounted on the upper surface of the workbench. The top of the longitudinal hollow shell is provided with a cylindrical shell integrally formed therewith. The interior of the longitudinal hollow shell contains a third component movable cavity, and the interior of the cylindrical shell contains a fourth component movable cavity. A liquid flow-limiting hole is provided at the center of the bottom end of the third component movable cavity. A third docking channel communicating with one side of the liquid flow-limiting hole is provided on one side of the bottom of the longitudinal hollow shell. A second piston plate capable of moving axially is placed inside the third component movable cavity, and a second helical spring in a compressed state is placed at the bottom of the second piston plate. The cylindrical housing has a shaft mounting hole at each end that connects to the end of the movable cavity of component number four. A rotating central shaft is mounted inside each shaft mounting hole via a bearing. A rotating column that can rotate is fixedly mounted at the opposite ends of the two central shafts. A connecting plate number four is fixedly mounted at one end of one of the central shafts. The connecting plate number four is fixedly connected to the connecting plate number one. The top end of the movable cavity of component number three and the movable cavity of component number four are connected through a through hole of rod number two. A locking rod with an integral structure is provided on the upper surface of the piston plate number two. The rod of the locking rod passes through the through hole of rod number two, and its top end abuts against the bottom surface of the rotating column.

[0014] Preferably, in its initial state, the second helical spring provides sufficient frictional resistance between the locking rod and the rotating column to keep the rotating column stationary without external force.

[0015] Preferably, the top of the locking rod is provided with a concave groove, and the groove is adapted to the outer circumferential surface of the rotating column.

[0016] Compared with the prior art, the present invention provides a battery casing strength testing device, which has the following advantages: 1. This device utilizes liquid pressure to perform strength testing on the battery casing, thereby reducing the space requirements for the equipment and ensuring stable testing. Furthermore, it uses an electromagnet to control the impact intensity of the equipment, providing stepless adjustment and thus increasing the effective testing range and accuracy of the equipment in strength testing.

[0017] 2. Equipped with a hydraulic supply mechanism, the impact head is driven by hydraulic pressure transmitted through a hydraulic hollow cylinder, a first piston plate, and a longitudinal telescopic rod. A first helical spring ensures automatic reset after impact. The polygonal rod body and perforations limit the circumferential deflection of the telescopic rod, resulting in smooth transmission. The hydraulic pressure drive eliminates the need for a traditional counterweight lifting structure, resulting in a compact structure with a small footprint. The stable and uniform hydraulic pressure output smoothly drives the impact head to complete the impact operation, ensuring consistent impact action and reducing testing errors.

[0018] 3. Equipped with an electromagnetic pressure control mechanism, the second liquid orifice is sealed by the repulsive force between the electromagnet and the permanent magnet at the end of the built-in valve plate. The valve plate opening resistance can be steplessly adjusted by changing the electromagnet current. The liquid flow groove on the outer periphery of the valve plate can smoothly drain excess hydraulic oil when overpressure occurs. The independent oil circuit space is formed by the horizontal hollow shell and the movable cavity of the second component. It can accurately control the upper limit of hydraulic pressure to stabilize the impact intensity, and can continuously adjust the pressure without replacing mechanical parts. The structure is compact, the control is convenient, and it can effectively avoid hydraulic overload and improve the testing accuracy.

[0019] 4. Equipped with an angle-controllable support mechanism, the impact angle of the entire machine can be flexibly adjusted through the rotating column and the central rotating shaft. The locking rod is lifted by hydraulic drive using the second piston plate inside the longitudinal hollow shell. The top slot of the locking rod fits against the outer wall of the rotating column to achieve reliable locking. The second helical spring is normally used for auxiliary pre-tightening positioning, which can quickly lock and fix the test position after the angle is adjusted. It can realize multi-directional impact testing of the battery shell, and the locking is firm and not easy to shift, effectively improving the stability and applicability of multi-angle testing. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the present invention; Figure 3 This is a perspective view of the hydraulic supply mechanism in this invention; Figure 4 This is a three-dimensional cross-sectional view of the hydraulic supply mechanism in this invention; Figure 5 This is a perspective view of the electromagnetic pressure control mechanism in this invention; Figure 6 This is a three-dimensional cross-sectional view of the electromagnetic pressure control mechanism in this invention; Figure 7 This is a perspective view of the angle-controllable support mechanism in this invention; Figure 8 This is a three-dimensional cross-sectional view of the angle-controllable support mechanism in this invention.

[0021] The components include: 1. Workbench; 2. Fixed sleeve No. 1; 3. Connecting plate No. 1; 4. Impact head; 5. Hydraulic supply mechanism; 51. Hydraulic hollow cylinder; 52. Movable cavity of component No. 1; 53. Through hole of rod No. 1; 54. Docking channel No. 1; 55. Liquid injection hole; 56. Liquid hole No. 1; 57. Piston plate No. 1; 58. Longitudinal telescopic rod; 59. Helical spring No. 1; 510. Connecting plate No. 2; 6. Electromagnetic pressure control mechanism; 61. Horizontal hollow shell; 62. Fixed sleeve No. 2; 63. Shell fixed cavity; 64. Liquid flow annular cavity; 65. Liquid hole No. 2; 66. Movable cavity of component No. 2; 67. Docking channel No. 2; 68. 69. Built-in valve plate; 610. Permanent magnet; 611. Liquid flow groove; 612. Built-in fixing frame; 613. Electromagnetic fixing cavity; 614. Electromagnet; 7. Wire mounting hole; 7. Angle-controllable support mechanism; 71. Longitudinal hollow shell; 72. No. 3 connecting plate; 73. Cylindrical shell; 74. No. 3 component movable cavity; 75. Liquid flow limiting hole; 76. No. 3 docking channel; 77. No. 2 rod through hole; 78. No. 4 component movable cavity; 79. Shaft mounting hole; 710. Central rotating shaft; 711. No. 4 connecting plate; 712. Rotating column; 713. No. 2 piston plate; 714. No. 2 helical spring; 715. Locking rod. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1 and Figure 2 A battery casing strength testing device includes a workbench 1 that provides support, a first fixing sleeve 2 with a first connecting plate 3 mounted on one side, and an impact head 4 capable of impacting the battery casing. First, the wire of the electromagnet 613 is connected to the output end of a current controller that can control the magnitude and direction of the current. The current output by the current controller causes the electromagnet 613 to generate a repulsive force on the permanent magnet 69. Then, the liquid injection hole 55 and the second docking channel 67 are connected to the liquid circuit of the hydraulic system that can control the direction of liquid flow through a pipe. The second docking channel 67 is also connected to the liquid return flow of the hydraulic system through a pipe. Then, the battery casing can be placed on the upper surface of the workbench 1, so that the test point of the battery casing is located on the movement path of the impact head 4.

[0024] To achieve the feed functionality required for impact, please refer to Figure 1 , Figure 2, Figure 3 and Figure 4 A hydraulic supply mechanism 5 needs to be installed, which includes a hollow hydraulic cylinder 51 fixedly installed in the first fixed sleeve 2, a first docking channel 54 that can introduce liquid into the hollow hydraulic cylinder 51, a first piston plate 57 placed inside the hollow hydraulic cylinder 51 and able to move downward under liquid pressure, and a longitudinal telescopic rod 58 that moves with the first piston plate 57 and can drive the impact head 4. The hydraulic system is started, so that liquid enters the interior of the first component movable cavity 52 through the liquid injection hole 55. When the liquid pressure is greater than the elastic strength of the first helical spring 59, the first piston plate 57 will move downward. The first piston plate 57 will then drive the impact head 4 downward through the longitudinal telescopic rod 58 until the impact head 4 impacts the corresponding part of the battery casing. By observing whether the deformation of the battery casing under the rated pressure meets the requirements, it can be determined whether the pressure resistance of the battery casing meets the standard.

[0025] For details regarding the specific structure of the hydraulic supply mechanism 5, please refer to [link / reference]. Figure 3 and Figure 4 It also includes a first component movable cavity 52 disposed inside the hydraulic hollow cylinder 51. The bottom end of the hydraulic hollow cylinder 51 has a first rod through hole 53 connecting the space below it and the bottom end of the first component movable cavity 52. ​​The top end of the hydraulic hollow cylinder 51 has a first docking channel 54 integrally formed with it. The interior of the first docking channel 54 has a liquid injection hole 55 connecting the space above it and the top end of the first component movable cavity 52. ​​The middle part of the first docking channel 54 has a first liquid hole 56 connecting the external space and the liquid injection hole 55. A first piston plate 57 capable of moving along its axial direction is housed inside the first component movable cavity 52. A longitudinal telescopic rod 58, which passes through the first rod body through the first rod body through the hole 53, is fixedly installed at the bottom end of the first piston plate 57. A first helical spring 59, which is in a compressed state, is sleeved around the rod body located inside the first component movable cavity 52 of the longitudinal telescopic rod 58. A second connecting plate 510 is fixedly installed at the bottom end of the longitudinal telescopic rod 58. The bottom end of the second connecting plate 510 is fixedly connected to the mounting end of the impact head 4. The cross-sectional shape of the first rod body through hole 53 is consistent with the cross-sectional shape of the longitudinal telescopic rod 58, both of which are polygonal structures. The structural dimensions of the cross-sectional shape of the first rod body through hole 53 match the structural dimensions of the cross-sectional shape of the longitudinal telescopic rod 58.

[0026] To achieve control over the stamping strength, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 5 and Figure 6An electromagnetic pressure control mechanism 6 needs to be installed. Its structure includes a horizontal hollow shell 61 fixedly installed around the first docking channel 54 and having a hollow internal structure; an internal valve plate 68 placed inside the horizontal hollow shell 61 and capable of controlling the liquid flow state; and an electromagnet 613 installed in the horizontal hollow shell 61 and capable of controlling the movement resistance of the internal valve plate 68. A directional current is injected into the coil of the electromagnet 613 through a current controller. At this time, the iron core in the electromagnet 613 generates a magnetic field under the magnetic effect of the current. By controlling the direction of the current, the magnetic poles at both ends of the iron core can be controlled, causing the iron core to generate a repulsive force against the permanent magnet 69. Under the action of this repulsive force, the internal valve plate 68 will block the discharge port of the second liquid hole 65 at the rated pressure. At the point where the liquid enters the liquid injection hole 55, it will generate directional pressure on the built-in valve plate 68. During the impact of the impact head 4 on the corresponding part of the battery casing, once the impact pressure is greater than the above-mentioned repulsive force, it will cause the built-in valve plate 68 to move. The excess liquid will then flow back into the hydraulic system in time through the first liquid hole 56, the liquid flow annular cavity 64, the second liquid hole 65, the movement gap of the built-in valve plate 68, the liquid flow groove 610, the second component moving cavity 66, and the second docking channel 67. The operator can control the magnitude of the above-mentioned repulsive force by controlling the magnitude of the current, thereby changing the rated impact intensity of the equipment, thus preventing the hydraulic overload from causing the impact intensity overload phenomenon, and effectively controlling the impact intensity.

[0027] For details regarding the specific structure of the electromagnetic pressure control mechanism 6, please refer to [link / reference]. Figure 5 and Figure 6It also includes a second fixing sleeve 62 integrally disposed at one end of a horizontal hollow shell 61. The second fixing sleeve 62 has a shell fixing cavity 63 fixedly fitted onto the circumferential side of a first docking channel 54. A liquid flow annular cavity 64 is disposed around the central region of the shell fixing cavity 63. A second component movable cavity 66 is disposed inside the horizontal hollow shell 61. One end of the second component movable cavity 66 is connected to one side of the liquid flow annular cavity 64 via a second liquid hole 65. The other end of the horizontal hollow shell 61 has a second docking channel 67 connecting to the other end of the second component movable cavity 66. An internal valve plate 68, capable of moving axially along the second component movable cavity 66, is disposed on the side of the second component movable cavity 66 near the second liquid hole 65. The outer circumferential surface of the internal valve plate 68 has multiple concave liquid flow structures. The groove 610 has a permanent magnet 69 embedded in the end of the built-in valve plate 68 opposite to the second liquid hole 65. The horizontal hollow shell 61 has a built-in fixing frame 611 installed in the middle of the shell fixing cavity 63. The center of the built-in fixing frame 611 is provided with an electromagnetic fixing cavity 612 with open ends. An electromagnet 613 is fixedly installed in the electromagnetic fixing cavity 612. The built-in fixing frame 611 and the horizontal hollow shell 61 are provided with wire mounting holes 614 for placing the wires of the electromagnet 613. The center line of the electromagnet 613 is on the same straight line as the center line of the permanent magnet 69, and this straight line coincides with the center line of the built-in valve plate 68. When working, the wires of the electromagnet 613 are connected to the output end of a current controller that can control the magnitude and direction of the current, and the current output by the current controller causes the electromagnet 613 to generate a repulsive force on the permanent magnet 69.

[0028] To achieve the function of controlling impact strength, please refer to Figure 1 , Figure 2 , Figure 7 and Figure 8An angle-controllable support mechanism 7 needs to be installed. Its structure includes a longitudinal hollow shell 71 fixedly installed on the upper surface of the workbench 1 and having a hollow internal structure; a rotating column 712 that can rotate with the first connecting plate 3; a second piston plate 713 placed inside the longitudinal hollow shell 71 and capable of moving upwards under liquid pressure; and a locking rod 715 that moves with the second piston plate 713 and can lock the rotating column 712. According to the required impact angle, the hydraulic hollow cylinder 51 is rotated in a directional manner. The hydraulic hollow cylinder 51 drives the central rotating shaft 710 to rotate in a directional manner through the first fixed sleeve 2. The central rotating shaft 710 then drives the rotating column 712 to rotate adaptively until the impact head 4 is aligned with the impact detection point of the battery casing. Then... The hydraulic system is activated, allowing fluid to enter the fluid flow restriction hole 75 and the interior of the movable chamber 74 of component 3 through the third docking channel 76. Under fluid pressure, the second piston plate 713 moves upward. When unlocking and readjusting the angle are required, the two-position three-way directional valve of the external hydraulic system is switched to the return oil position. The hydraulic oil in the movable chamber 74 of component 3 is discharged back to the oil tank through the third docking channel 76. The second piston plate 713 retracts downward under the restoring force of the second helical spring 714, releasing the locking rod 715 from locking the rotating column 712. At this time, the second piston plate 713 will increase the locking strength of the locking rod 715 on the rotating column 712 until the locking strength meets the requirements, thereby realizing the function of controlling the impact strength.

[0029] For details regarding the specific structure of the angle-controllable support mechanism 7, please refer to [link / reference]. Figure 7 and Figure 8It also includes a third connecting plate 72 disposed at the bottom of the longitudinal hollow shell 71 and fixedly installed on the upper surface of the workbench 1. The top of the longitudinal hollow shell 71 is provided with a cylindrical shell 73 integrally formed with it. The interior of the longitudinal hollow shell 71 is provided with a third component movable cavity 74. The interior of the cylindrical shell 73 is provided with a fourth component movable cavity 78. A liquid flow restricting hole 75 is provided at the center of the bottom end of the third component movable cavity 74. A third docking channel 76 communicating with one side of the liquid flow restricting hole 75 is provided on one side of the bottom of the longitudinal hollow shell 71. The third component's movable cavity 74 houses a second piston plate 713 capable of axial movement. A second helical spring 714 in a compressed state is placed at the bottom of the second piston plate 713. The cylindrical housing 73 has a shaft mounting hole 79 at each end, connecting to the end of the fourth component's movable cavity 78. Each shaft mounting hole 79 has a rotatable central shaft 710 mounted inside via a bearing. A rotating column 712, capable of rotating with the two central shafts 710, is fixedly mounted at their opposite ends. One of the central shafts... A fourth connecting plate 711 is fixedly installed at one end of the pivot shaft 710. The fourth connecting plate 711 is fixedly connected to the first connecting plate 3. The top end of the third component movable cavity 74 and the fourth component movable cavity 78 are connected through the second rod through hole 77. A locking rod 715 with an integral structure is provided on the upper surface of the second piston plate 713. The rod of the locking rod 715 passes through the second rod through hole 77, and its top end abuts against the bottom surface of the rotating column 712. In the initial state, the second helical spring 714 causes the locking rod 715 to lock the rotating column 712. The frictional resistance formed by 12 is sufficient to keep the rotating column 712 stationary without external force. The top of the locking rod 715 is provided with a concave groove, which is adapted to the outer circumferential surface of the rotating column 712. The inner surface of the groove and the outer circumferential surface of the rotating column 712 are provided with meshing anti-slip teeth to prevent angular slippage caused by vibration during severe impact testing. In addition, the outside of the horizontal hollow shell 61 is also wrapped with a heat insulation shielding layer to prevent the permanent magnet 69 on the built-in valve plate 68 from demagnetizing at high temperature due to continuous overflow and heat generation of hydraulic oil.

[0030] In use, firstly, the wires of the electromagnet 613 are connected to a current controller that can control the magnitude and direction of the current. The current output by the current controller causes the electromagnet 613 to generate a repulsive force on the permanent magnet 69. Then, the liquid injection hole 55 and the second docking channel 67 are connected to the liquid circuit of the hydraulic system that can control the direction of liquid flow through a pipe. The second docking channel 67 is also connected to the liquid return flow of the hydraulic system through a pipe. Then, the battery casing can be placed on the upper surface of the workbench 1. According to the required impact angle, the hydraulic hollow cylinder 51 is rotated in a directional manner. The hydraulic hollow cylinder 51 will drive the central rotating shaft 710 to rotate in a directional manner through the first fixed sleeve 2. The central rotating shaft 710 will then drive the rotating column 712 to rotate adaptively until the impact head 4 is aligned with the impact detection point of the battery casing. Then the hydraulic system can be started, so that the liquid enters the liquid flow restriction hole 75 and the interior of the third component moving cavity 74 through the third docking channel 76. Under the liquid pressure, the second piston plate 713 will move upward. At this time, the second piston plate 713 will increase the locking strength of the locking rod 715 on the rotating column 712 until the locking strength meets the requirements. The hydraulic system is activated, allowing liquid to enter the interior of the movable chamber 52 of component 1 through the liquid injection hole 55. When the liquid pressure is greater than the elastic strength of the coil spring 59, it will cause piston plate 57 to move downward. Piston plate 57 will then drive impact head 4 downward through longitudinal telescopic rod 58 until impact head 4 impacts the corresponding part of the battery casing. By observing whether the deformation of the battery casing under rated pressure meets the requirements, it can be determined whether the pressure resistance of the battery casing meets the standard. A directional current is injected into the coil of electromagnet 613 via a current controller. At this time, the iron core in electromagnet 613 generates a magnetic field under the magnetic effect of the current. By controlling the direction of the current, the magnetic poles at both ends of the iron core can be controlled, causing the iron core to repel the permanent magnet 69. Under the action of this repulsive force, the built-in valve plate 68 will block the discharge port of the second liquid hole 65 at rated pressure. The liquid entering the liquid injection hole 55 will generate directional pressure on the built-in valve plate 68. During the impact of the impact head 4 on the corresponding part of the battery casing, once the impact pressure... When the repulsive force exceeds the specified value, the built-in valve plate 68 will move, and the excess liquid will flow back into the hydraulic system through the first liquid hole 56, the liquid flow annular cavity 64, the second liquid hole 65, the movement gap of the built-in valve plate 68, the liquid flow groove 610, the second component movable cavity 66, and the second docking channel 67. The operator can control the magnitude of the repulsive force by controlling the current, thereby changing the rated impact strength of the equipment, preventing hydraulic overload and impact strength overload, and effectively controlling the impact strength.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A battery casing strength testing device, comprising a worktable (1) providing support, a fixing sleeve (2) with a connecting plate (3) mounted on one side, and an impact head (4) capable of impacting the battery casing, characterized in that: It also includes, The hydraulic supply mechanism (5) includes a hydraulic hollow cylinder (51) fixedly installed in the first fixed sleeve (2) and having a hollow internal structure, a first docking channel (54) capable of introducing liquid into the hydraulic hollow cylinder (51), a first piston plate (57) placed inside the hydraulic hollow cylinder (51) and capable of moving downward under liquid pressure, and a longitudinal telescopic rod (58) that moves with the first piston plate (57) and can drive the impact head (4) to move. And an electromagnetic pressure control mechanism (6), the structure of which includes a horizontal hollow shell (61) fixedly installed on the periphery of the No. 1 docking channel (54) and having a hollow internal structure, an internal valve plate (68) placed inside the horizontal hollow shell (61) and capable of controlling the liquid flow state, and an electromagnet (613) installed on the horizontal hollow shell (61) and capable of controlling the movement resistance of the internal valve plate (68).

2. The battery casing strength testing device according to claim 1, characterized in that: The hydraulic supply mechanism (5) further includes a first component movable cavity (52) disposed inside the hydraulic hollow cylinder (51). The bottom end of the hydraulic hollow cylinder (51) is provided with a first rod through hole (53) connecting the space below it and the bottom end of the first component movable cavity (52). The top end of the hydraulic hollow cylinder (51) is provided with a first docking channel (54) integrally formed with it. The interior of the first docking channel (54) is provided with a liquid injection hole (55) connecting the space above it and the top end of the first component movable cavity (52). The middle part of the first docking channel (54) is provided with a connection between the external space and the liquid injection hole (55). 55) The first liquid hole (56) is located inside the first component movable cavity (52), and a first piston plate (57) capable of moving along its axial direction is placed inside. A longitudinal telescopic rod (58) that passes through the first rod body through hole (53) is fixedly installed at the bottom end of the first piston plate (57). A first spiral spring (59) in a compressed state is sleeved on the outside of the rod body located inside the first component movable cavity (52). A second connecting plate (510) is fixedly installed at the bottom end of the longitudinal telescopic rod (58). The bottom end of the second connecting plate (510) is fixedly connected to the mounting end of the impact head (4).

3. The battery casing strength testing device according to claim 2, characterized in that: The cross-sectional shape of the perforation (53) of the first rod is consistent with the cross-sectional shape of the longitudinal telescopic rod (58), both being polygonal structures, and the structural dimensions of the cross-sectional shape of the perforation (53) of the first rod are matched with the structural dimensions of the cross-sectional shape of the longitudinal telescopic rod (58).

4. The battery casing strength testing device according to claim 3, characterized in that: The electromagnetic pressure control mechanism (6) further includes a second fixing sleeve (62) integrally disposed at one end of the horizontal hollow shell (61). The second fixing sleeve (62) has a shell fixing cavity (63) fixedly disposed on the circumferential side of the first docking channel (54). The second fixing sleeve (62) has a liquid flow annular cavity (64) disposed on the periphery of the shell fixing cavity (63) in the middle area of ​​the shell fixing cavity (63). The horizontal hollow shell (61) has a second component movable cavity (66) disposed inside. One end of the second component movable cavity (66) is connected to one side of the liquid flow annular cavity (64) through a second liquid hole (65). The other end of the horizontal hollow shell (61) is provided with a second docking channel (67) connecting the other end of the second component movable cavity (66). The second component movable cavity (66) is located near the... An internal valve plate (68) capable of moving axially along the movable cavity (66) of the second component is provided on one side of the second liquid hole (65). The outer circumferential surface of the internal valve plate (68) is provided with multiple concave liquid flow grooves (610). A permanent magnet (69) is embedded in the end of the internal valve plate (68) away from the second liquid hole (65). An internal fixing frame (611) is installed in the middle of the housing fixing cavity (63) of the horizontal hollow shell (61). An electromagnetic fixing cavity (612) with open ends is provided at the center of the internal fixing frame (611). An electromagnet (613) is fixedly installed in the electromagnetic fixing cavity (612). The internal fixing frame (611) and the horizontal hollow shell (61) are provided with wire mounting holes (614) for placing the wires of the electromagnet (613).

5. The battery casing strength testing device according to claim 4, characterized in that: The centerline of the electromagnet (613) and the centerline of the permanent magnet (69) are on the same straight line, and the straight line coincides with the centerline of the built-in valve plate (68).

6. The battery casing strength testing device according to claim 5, characterized in that: When in operation, the wire of the electromagnet (613) is connected to the output end of a current controller that can control the magnitude and direction of the current, and the current output by the current controller causes the electromagnet (613) to generate a repulsive force on the permanent magnet (69).

7. The battery casing strength testing device according to claim 6, characterized in that: It also includes an angle-controllable support mechanism (7), the structure of which includes a longitudinal hollow shell (71) fixedly installed on the upper surface of the workbench (1) and having a hollow internal structure, a rotating column (712) that can rotate with the first connecting plate (3), a second piston plate (713) placed inside the longitudinal hollow shell (71) and capable of moving upward under liquid pressure, and a locking rod (715) that moves with the second piston plate (713) and can lock the rotating column (712).

8. The battery casing strength testing device according to claim 7, characterized in that: The angle-controllable support mechanism (7) further includes a third connecting plate (72) disposed at the bottom of the longitudinal hollow shell (71) and fixedly installed on the upper surface of the workbench (1). The top of the longitudinal hollow shell (71) is provided with a cylindrical shell (73) integrally formed with it. The interior of the longitudinal hollow shell (71) is provided with a third component movable cavity (74). The interior of the cylindrical shell (73) is provided with a fourth component movable cavity (78). A liquid flow limiting hole (75) is provided at the center of the bottom end of the third component movable cavity (74). A third docking channel (76) communicating with one side of the liquid flow limiting hole (75) is provided on one side of the bottom of the longitudinal hollow shell (71). A second piston plate (713) capable of moving along its axial direction is placed inside the third component movable cavity (74). A second helical spring (714) in a compressed state is placed at the bottom of the second piston plate (713). The cylindrical shell The body (73) has a shaft mounting hole (79) at each end that connects to the end of the fourth component movable cavity (78). Each shaft mounting hole (79) has a rotating central shaft (710) installed inside by a bearing. A rotating column (712) that can rotate is fixedly installed at the opposite ends of the two central shafts (710). A fourth connecting plate (711) is fixedly installed at one end of one of the central shafts (710). The fourth connecting plate (711) is fixedly connected to the first connecting plate (3). The top end of the third component movable cavity (74) and the fourth component movable cavity (78) are connected by a second rod through hole (77). The upper surface of the second piston plate (713) is provided with a locking rod (715) that is integral with it. The rod of the locking rod (715) passes through the second rod through hole (77) and the top end abuts against the bottom surface of the rotating column (712).

9. A battery casing strength testing device according to claim 8, characterized in that: In its initial state, the second helical spring (714) provides sufficient frictional resistance between the locking rod (715) and the rotating column (712) to keep the rotating column (712) stationary without external force.

10. A battery casing strength testing device according to claim 9, characterized in that: The top of the locking rod (715) is provided with a concave groove, and the groove is adapted to the outer circumferential surface of the rotating column (712).

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