Device for testing compaction density of positive electrode material for battery

Abstract

The utility model discloses a compaction density testing device for a positive electrode material for a battery, and belongs to the field of compaction density. The testing device comprises a device body, the device body is composed of a top frame, a bottom frame and a vertical frame between the top frame and the bottom frame, a driving mechanism is fixedly installed on the bottom face of the top frame, a connecting block is fixedly arranged on the driving mechanism, an opening is formed in one side wall of the connecting block, and the vertical frame is fixedly arranged on the bottom face of the top frame. A helical rack is installed at the opening, a reset spring is arranged in the connecting block, and the two ends of the reset spring are connected with the helical rack and the other side wall of the connecting block respectively. A belt wheel synchronous transmission device is arranged in the vertical frame, a bevel gear and a reciprocating lead screw are arranged on an upper belt wheel and a lower belt wheel in the belt wheel synchronous transmission device respectively, the bevel gear is matched with the helical rack, and the reciprocating lead screw is connected with a base arranged on the bottom frame. According to the device, the positive electrode material can be quickly pushed out of the pressing seat without replacing the demolding base, so that the working efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of compaction density and relates to a compaction density testing device for positive electrode materials used in batteries. Background Technology

[0002] Compacted density refers to the mass per unit volume of a material after it has been subjected to pressure. It is commonly used to describe the density of a material after it has been compacted. In lithium-ion battery design, compacted density is an important parameter because it directly affects the battery's performance, including capacity, efficiency, internal resistance, and cycle performance.

[0003] However, after the existing technology completes the compaction density test of the battery cathode material, it is necessary to replace the lower pressure seat with a demolding base, and then push out the compacted battery cathode material inside the pressure seat through a device, which is inconvenient to use. In order to solve this problem, it is necessary for those skilled in the art to develop a compaction density test device for battery cathode materials. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a battery cathode material compaction density testing device. By setting helical racks and helical gears, the compacted cathode material can be quickly ejected without the need for operators to change the demolding base, thus reducing the number of operation steps for operators and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a device for testing the compaction density of positive electrode materials for batteries, including a main body. The main body consists of a top frame, a bottom frame, and a vertical frame between the top and bottom frames. A driving mechanism is fixedly installed on the bottom surface of the top frame, and a connecting block is fixedly installed on the driving mechanism. An opening is provided on one side wall of the connecting block, and a helical rack is installed at the opening. A return spring is provided inside the connecting block, and the two ends of the return spring are respectively connected to the helical rack and the other side wall of the connecting block. A pulley synchronous transmission device is provided inside the vertical frame. The upper and lower pulleys of the pulley synchronous transmission device are respectively provided with helical gears and reciprocating screws. The helical gears and helical racks cooperate with each other, and the reciprocating screw is connected to a base provided on the bottom frame.

[0007] In one embodiment, the drive mechanism includes an electric push rod and a pressure plate. The electric push rod is fixedly connected to the bottom surface of the top frame, the pressure plate is fixedly connected to the bottom of the electric push rod, and the connecting block is fixedly disposed on the top surface of the pressure plate.

[0008] In one embodiment, the connecting block is a hollow box, which consists of a top surface, a bottom surface, and a first side wall and a second side wall located opposite to the top surface and the bottom surface. An opening is provided on the first side wall, and a helical rack is provided at the position of the opening. A return spring is provided inside the hollow box, with one end of the return spring connected to the helical rack and the other end connected to the second side wall opposite to the helical rack.

[0009] In one embodiment, the pulley synchronous transmission device includes a first pulley, a second pulley, and a synchronous belt, wherein the first pulley is located above the second pulley, and the synchronous belt is sleeved between the first pulley and the second pulley.

[0010] In one embodiment, the helical gear is fixedly mounted on the side of the first pulley near the connecting block, the reciprocating screw is mounted on the second pulley, the reciprocating screw is connected to the base, and the base is mounted above the bottom frame.

[0011] In one embodiment, the base is divided into a support portion and a testing portion; the testing portion is a solid portion, and the support portion is a downwardly recessed portion.

[0012] In one embodiment, a plurality of support plates are spaced apart inside the groove portion. One end of each support plate is connected to the test portion, and a bidirectional threaded rod is provided through the other end of each support plate. The two ends of the bidirectional threaded rod are respectively in contact with the inner walls of the two sides of the base.

[0013] In one embodiment, the height of the support plate is flush with the height of the solid portion; the spacing between the support plates is not less than the diameter of the positive electrode material.

[0014] In one embodiment, a pressure seat and a clamping assembly are provided above the base, the clamping assembly being used to clamp the pressure seat.

[0015] In one embodiment, a plunger is inserted into the interior of the pressure base, and two pressure anvils are disposed below the plunger, with a positive electrode material disposed between the two pressure anvils.

[0016] In one embodiment, the clamping assembly includes a fixed clamping plate, a movable clamping plate, a telescopic rod, a pressure spring, and a pulling member; the fixed clamping plate and the movable clamping plate are arranged opposite each other to jointly clamp the pressure seat; the fixed clamping plate is fixedly mounted on one side wall of the bottom frame; the telescopic rod is connected to the other side wall of the bottom frame; one end of the movable clamping plate and the telescopic rod are fixedly connected; the other end of the telescopic rod is connected to the pulling member; a pressure spring is provided inside the telescopic rod; the pulling member passes through the other side wall of the bottom frame; and the pulling member passes through the pressure spring, the telescopic rod, and is connected to the movable clamping plate.

[0017] In one embodiment, a pressure sensor is provided on the pressure plate.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention provides a device for testing the compaction density of positive electrode materials for batteries. During material unloading, the upward-rising helical rack of the drive mechanism rises and engages with the helical teeth of the helical gear, thereby driving the helical gear to rotate. The rotation of the helical gear is transmitted to the lower pulley via the upper pulley and synchronous belt in the pulley synchronous transmission device, which in turn drives the reciprocating screw to move, causing the base to slide along the interior of the device body. When the drive mechanism descends again, the helical rack is compressed and contracted by the relative helical teeth of the helical gear and enters the interior of the connecting block. Due to the action of the return spring, it can smoothly slide past the helical gear without driving it to rotate again. The compacted positive electrode material in the pressure seat and the unloading base located at the bottom of the drive mechanism is pushed out and easily removed. The movement of the reciprocating screw drives the back-and-forth sliding of the base, allowing the positive electrode material to be quickly pushed out of the pressure seat without replacing the unloading base, thus improving work efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a battery cathode material compaction density testing device according to the present invention;

[0021] Figure 2 This is a cross-sectional view of the main structure of a battery cathode material compaction density testing device according to the present invention;

[0022] Figure 3 for Figure 2 Enlarged view of the structure of section A in the middle;

[0023] Figure 4 This is a vertical frame cross-sectional view of a battery cathode material compaction density testing device according to the present invention;

[0024] Figure 5 for Figure 4 Enlarged view of the structure of section B in the middle;

[0025] Figure 6 This is a cross-sectional schematic diagram of the connecting block portion in a device for testing the compaction density of positive electrode materials for batteries.

[0026] Wherein: 1-Bracket; 2-Main body of device; 3-Electric push rod; 4-Pressure plate; 5-Connecting block; 6-Reset spring; 7-Helical rack; 8-Helical gear; 9-First pulley; 10-Synchronous belt; 11-Second pulley; 12-Reciprocating screw; 13-Base; 14-Support plate; 15-Double threaded rod; 16-Telescopic rod; 17-Modible clamping plate; 18-Pressure spring; 19-Pull component; 20-Pressure seat; 21-Plunger; 22-Pressure anvil; 23-Positive electrode material; 24-Computer; 25-First sidewall; 26-Second sidewall. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 should fall within the protection scope of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] The present invention will now be described in further detail with reference to the accompanying drawings:

[0030] like Figures 1 to 5 As shown, this utility model provides a compaction density testing device for positive electrode materials used in batteries. The main body 2 of the device constitutes the basic structure of the testing device, which consists of three parts: a top frame, a bottom frame, and a vertical frame connecting the two. A drive mechanism is installed on the bottom surface of the top frame. The drive mechanism includes an electric push rod 3 and a pressure plate 4. The lower end of the electric push rod 3 is connected to the pressure plate 4. A connecting block 5 is fixedly connected to the top of the pressure plate 4. A pulley synchronous transmission device is set inside the vertical frame. The upper and lower pulleys of the pulley synchronous transmission device are respectively equipped with helical gears 8 and reciprocating screws 12. The helical gears 8 and helical racks 7 cooperate with each other. The reciprocating screw 12 is connected to a base 13 set on the bottom frame.

[0031] like Figure 6 As shown, the connecting block 5 is a hollow box, consisting of a top surface, a bottom surface, and a first sidewall 25 and a second sidewall 26 located opposite each other between the top and bottom surfaces. An opening is provided on the first sidewall 25, and a helical rack 7 is positioned at the opening. A return spring 6 is installed inside the hollow box, with one end connected to the helical rack 7 and the other end connected to the second sidewall 26 opposite to the helical rack 7. In other words, a return spring 6 is embedded in the internal structure of the connecting block 5, and one end of the return spring 6 is fixed to the helical rack 7, which can slide inside the connecting block 5.

[0032] The connecting block 5 is divided into a first part and a second part. The first part is fixedly connected to the pressure plate 4, and the second part extends out of the pressure plate 4. The helical rack 7 moves inside the second part.

[0033] The pulley synchronous transmission device includes a first pulley 9, a second pulley 11, and a synchronous belt 10. The first pulley 9 is located above the second pulley 11, and the synchronous belt 10 is sleeved between the first pulley 9 and the second pulley 11. Specifically, the first pulley 9 and the second pulley 11 are arranged vertically inside the vertical frame and are linked by the synchronous belt 10. A helical gear 8 is fixedly installed on the side of the first pulley 9 near the connecting block 5. A reciprocating screw 12 is installed on the second pulley 11 and is connected to the base 13.

[0034] In one specific embodiment, the base 13 is disposed above the bottom frame, wherein the base 13 is divided into a support part and a test part; the test part is a solid part, and the support part is a downwardly recessed part.

[0035] Specifically, multiple support plates 14 are arranged at certain intervals inside the groove. One end of each support plate 14 is connected to the test section, and a bidirectional threaded rod 15 is provided through the other end. The two ends of the bidirectional threaded rod 15 are respectively in contact with and rotatably connected to the inner walls of the left and right sides of the base 13. The height of the support plate 14 is flush with the height of the test section, and the spacing between each support plate 14 is set to be no less than the diameter of the positive electrode material 23 to be tested.

[0036] Furthermore, the base 13 is divided into a support section and a testing section. This design allows the base 13 to perform more functions during testing. The testing section is solid, providing a stable support surface for supporting the pressure seat 20 and the positive electrode material 23 during compaction density testing. The support section is a downward-facing groove, facilitating subsequent material removal. Several support plates 14 are spaced apart inside the groove. One end of each support plate 14 is connected to the testing section, and the other end is adjusted via a bidirectional threaded rod 15. This design allows the spacing between the support plates 14 to be flexibly adjusted according to the size of the positive electrode material 23, ensuring that the positive electrode material 23 falls stably into the gaps between the support plates 14 during testing, preventing displacement or deformation. When the positive electrode material 23 is pushed out, it falls directly onto the support plates 14. Simultaneously, the spacing between the support plates 14 is not less than the diameter of the positive electrode material 23, ensuring that the positive electrode material 23 is not obstructed during removal, thereby improving removal efficiency.

[0037] In one specific embodiment, a pressure seat 20 and a clamping assembly are provided above the base 13, the clamping assembly being used to clamp the pressure seat 20.

[0038] Specifically, a plunger 21 is inserted into the inside of the pressure base 20, and two pressure anvils 22 are arranged below the plunger 21, with a positive electrode material 23 arranged between the two pressure anvils 22.

[0039] The aforementioned clamping assembly includes a fixed clamping plate, a movable clamping plate 17, a telescopic rod 16, a pressure spring 18, and a pulling member 19. The fixed clamping plate is securely mounted on one side wall of the bottom frame, opposite the movable clamping plate 17; the two work together to clamp objects. The movable clamping plate 17 is connected to the other side wall of the bottom frame via the telescopic rod 16. Specifically, one end of the telescopic rod 16 is fixedly connected to the movable clamping plate 17, while the other end is connected to the pulling member 19. Inside the telescopic rod 16, a pressure spring 18 is disposed, providing the elastic force required for resetting and clamping. The pulling member 19 extends from the other side wall of the bottom frame, passes through the pressure spring 18 and the interior of the telescopic rod 16, and finally connects to the movable clamping plate 17, allowing the operator to adjust the position of the movable clamping plate 17 by pulling the pulling member 19.

[0040] Furthermore, the design of the pressure seat 20 and the clamping assembly ensures that the positive electrode material 23 can be stably placed in the predetermined position during testing, avoiding testing errors caused by material displacement. The clamping assembly clamps the pressure seat 20 together with the fixed clamping plate and the movable clamping plate 17, providing a reliable limiting effect and ensuring that the pressure seat 20 will not shift during compaction. The introduction of the clamping assembly makes the placement and positioning of the pressure seat 20 much simpler. The operator only needs to pull the pull member 19 to adjust the position of the movable clamping plate 17, place the pressure seat 20 on the base 13, and then release the pull member 19. The clamping assembly will automatically reset and clamp the pressure seat 20, greatly simplifying the operation process.

[0041] Furthermore, the pressure seat 20 and clamping assembly are combined with the device's automated unloading system to achieve rapid unloading of the cathode material 23. After testing, the electric push rod 3 drives the support plate 14 of the base 13 to the bottom of the pressure seat 20 via a series of mechanical transmissions. Then, the pressure plate 4 descends again, pushing the cathode material 23 and the pressure anvil 22 out of the pressure seat 20 and into the space between the support plates 14. This process requires no manual intervention, greatly improving unloading efficiency. In addition, this setup also supports multiple pressurization operations on the cathode material 23. When the electric push rod 3 drives the pressure plate 4 to contract a certain stroke and then descends, the helical rack 7 is driven to descend before it drives the helical gear 8 to rotate, thus realizing multiple pressurization tests on the cathode material 23. This design allows the device to meet more complex testing requirements.

[0042] In one specific embodiment, a pressure sensor is installed on the pressure plate 4. This pressure sensor is primarily used to measure and monitor pressure. The pressure sensor accurately measures the pressure applied by the pressure plate 4 to the plunger 21, ensuring that the positive electrode material 23 is compacted to a predetermined degree within the pressure seat 20 and between the two pressure anvils 22. During the compaction process, the pressure sensor monitors pressure changes in real time and transmits this data to the computer 24 or other display instruments. This allows operators to understand the compaction status of the positive electrode material 23 under different pressures in real time, enabling accurate judgments and decisions. When multiple pressure tests are required on the positive electrode material 23, the pressure sensor records the pressure data during each pressure test, providing comprehensive test data support for operators. This helps operators analyze the compaction performance and stability of the positive electrode material 23.

[0043] The operation procedure of the battery cathode material compaction density testing device is as follows:

[0044] S1: Initial preparation and test setup: When the staff needs to test the compaction density of the positive electrode material 23, first insert a pressure anvil 22 into the inside of the pressure base 20, then place the positive electrode material 23 on top of the pressure anvil 22 inside the pressure base 20, insert another pressure anvil 22 into the inside of the pressure base 20 and press it on top of the positive electrode material 23, and then insert the plunger 21 on top of the pressure base 20.

[0045] S2: Positioning and preparation before compaction: The operator can pull the puller 19, which pulls the movable clamping plate 17 to compress the pressure spring 18 and the telescopic rod 16, thereby placing the pressure seat 20 on top of the base 13. Then, the puller 19 is released, allowing the pressure spring 18 to push the movable clamping plate 17 and the telescopic rod 16 back to their original positions. This allows the movable clamping plate 17 to position the pressure seat 20 and provide a certain degree of limiting effect, preventing the pressure seat 20 from shifting during the compaction process and affecting the compaction density detection of the positive electrode material 23.

[0046] S3: Compaction and density test of positive electrode material 23: The operator can start the main body 2 of the device, so that the main body 2 pushes the pressure plate 4 down through the electric push rod 3 and presses it on the top of the plunger 21. This causes the plunger 21 to apply pressure to the pressure anvil 22, so that the positive electrode material 23 is compacted inside the pressure seat 20 and between the two pressure anvils 22. The sensor on the pressure plate 4 transmits the force applied to the plunger 21 to the computer 24 for the operator to observe. This allows the operator to know the degree of compaction of the positive electrode material 23 under different pressures, so as to achieve the effect of testing the compaction density of the positive electrode material 23.

[0047] S4: Material Retraction Operation: When the operator has finished compacting the positive electrode material 23 and needs to push it out of the pressure base 20, the operator can control the electric push rod 3 to fully retract and reset and descend again. During this process, the pressure plate 4 will drive the helical rack 7 to slide upward along the inside of the device body 2 through the connecting block 5, so that the helical teeth on the helical rack 7 hook together with the helical teeth on the helical gear 8, thereby causing the helical rack 7 to drive the helical gear 8 to rotate. The helical gear 8 drives the synchronous belt 10 to rotate through the first pulley 9, and the synchronous belt 10 drives the reciprocating screw 12 to move through the second pulley 11. The movement of the reciprocating screw 12 will drive the base 13 to slide along the inside of the device body 2, so that the support plate 14 inside the base 13 moves to the bottom of the pressure base 20. During the process of the electric push rod 3 driving the pressure plate 4 to descend again, the pressure plate 4 will drive the reciprocating screw 12 to slide upward along the inside of the device body 2 through the connecting block 5. Connecting block 5 drives the helical rack 7 to descend. At this time, the helical teeth of the helical rack 7 cannot hook with the helical teeth of the helical gear 8, causing the helical rack 7 to be squeezed relative to the helical teeth of the helical gear 8. This causes the helical rack 7 to compress the return spring 6 and enter the interior of connecting block 5, preventing the helical gear 8 from rotating. As the pressure plate 4 continues to descend, the pressure plate 4 applies pressure to the plunger 21, causing the plunger 21 to push the pressure anvil 22 and the positive electrode material 23 out of the pressure seat 20. This allows the pressure anvil 22 and the positive electrode material 23 to fall into the space between the two support plates 14, achieving the effect of quickly removing the pressure anvil 22 and the positive electrode material 23. This eliminates the need for the operator to replace the mold release base. The pressure seat 20 at the bottom of the pressure plate 4 and the pressure anvil 22 and the positive electrode material 23 in the mold release base are pushed out by the pressure plate 4, improving the user experience and reducing the number of steps required by the operator.

[0048] S5: Base Reset and Multiple Pressurization Operation: When the pressure plate 4 pushes the pressure anvil 22 and positive electrode material 23 out of the pressure seat 20 through the plunger 21 and is fully reset by the electric push rod 3, the pressure plate 4 will drive the helical rack 7 to rise again through the connecting block 5. At this time, the reset spring 6 inside the connecting block 5 pushes the helical rack 7 out of the connecting block 5, allowing the helical rack 7 to drive the helical gear 8 to rotate again. Finally, the reciprocating screw 12 drives the base 13 to reset. During the process of the electric push rod 3 pushing the pressure plate 4 down and completing the reset, the base 13 will cycle between supporting the bottom of the pressure seat 20 and supporting the bottom of the pressure seat 20 by the support plate 14, making it convenient for the staff to take out the positive electrode material 23. When the staff needs to pressurize the positive electrode material 23 multiple times, the electric push rod 3 can drive the pressure plate 4 to contract a certain stroke and then descend, so that the helical rack 7 is driven down before it drives the helical gear 8 to rotate.

[0049] Refer to the instruction manual appendix Figure 1-5 In one embodiment, a compaction density testing device for positive electrode materials used in batteries is provided, including a support 1, as detailed below. Figure 1The support frame 1 serves as the basic support structure for the entire testing device. The main body 2 of the device is fixedly mounted on top of the support frame 1. The main body 2 consists of a top frame, a bottom frame, and a vertical frame connecting the two. An electric push rod 3 is fixedly mounted on the bottom surface of the top frame to provide the pressure required for compaction. The electric push rod 3 is fixed to the top frame of the main body 2, and its bottom is connected to a pressure plate 4. It compacts the positive electrode material 23 through its telescopic movement. The pressure plate 4 directly applies pressure to the positive electrode material 23, and a connecting block 5 is fixedly connected to its top. A pressure sensor is also installed on the pressure plate 4 to monitor pressure changes during the compaction process in real time.

[0050] See details Figure 3 and Figure 6The connecting block 5 is a hollow box structure, with a return spring 6 and a helical rack 7 inside. The helical rack 7 can slide inside the connecting block and is reset by the return spring 6. The return spring 6 is fixedly installed inside the connecting block 5, and the helical rack 7 is fixedly installed at one end of the return spring 6. The helical rack 7 is slidably connected inside the connecting block 5. The vertical frame has a first pulley 9 and a second pulley 11 inside. The first pulley 9 is located above the second pulley 11. A synchronous belt 10 is sleeved on the outer wall of the first pulley 9, and the second pulley 11 is inserted into the inside of the synchronous belt 10. The second pulley 11 is rotatably connected inside the main body 2 of the device. A helical gear 8 is fixedly connected to the side of the first pulley 9 near the connecting block 5. The first pulley 9 is connected to the second pulley 11 through the synchronous belt 10. When the helical rack 7 drives the helical gear 8 to rotate, it can drive the synchronous belt 10 and the second pulley 11 to rotate. A reciprocating screw 12 is threadedly connected inside the second pulley 11, and a base 13 is fixedly connected to one end of the reciprocating screw 12. The base 13 is positioned above the bottom frame inside the main body 2 of the device and is divided into a support section and a testing section. It slides within the main body 2 to support and eject the compacted positive electrode material 23. The testing section is a solid structure to provide stable support; the support section is designed with a downward-facing groove to facilitate the ejection of the positive electrode material 23. A support plate 14 is slidably connected inside the base 13, and a bidirectional threaded rod 15 is threadedly connected inside the support plate 14. Two spaced-apart support plates 14 are arranged inside the groove of the base 13. One end of each support plate 14 is fixedly connected to the testing section, and the other end is through which the bidirectional threaded rod 15 passes. Both ends of the bidirectional threaded rod 15 are rotatably connected to the left and right inner walls of the base 13, allowing the spacing between the support plates 14 to be adjusted by rotating the bidirectional threaded rod 15. The height of the support plate 14 is set to be flush with the height of the testing section to ensure the stability of the positive electrode material 23 during testing. Meanwhile, to accommodate positive electrode materials 23 of different diameters, the spacing between each support plate 14 is set to be no less than the diameter of the positive electrode material 23 to be tested. A pressure seat 20 and a clamping assembly are provided above the base 13. The clamping assembly is used to clamp the pressure seat 20 and includes a fixed clamping plate, a movable clamping plate 17, a telescopic rod 16, a pressure spring 18, and a pulling member 19. The clamping assembly is used to clamp the pressure seat 20 to prevent displacement during compaction. One end of the telescopic rod 16 is fixedly connected to the movable clamping plate 17. A pressure spring 18 is provided inside the telescopic rod 16 and is fixedly installed on one side of the movable clamping plate 17. The pulling member 19 is fixedly connected to one side of the movable clamping plate 17 and is inserted into the device body 2 and the pressure spring 18. The pressure seat 20 is located on top of the base 13, and a plunger 21 is inserted inside. Two pressure anvils 22 are provided below the plunger 21, and the positive electrode material 23 is placed between the two pressure anvils 22.The computer 24 is electrically connected to the pressure sensor and is used to receive and process the data transmitted by the pressure sensor, and to display the compaction density test results of the positive electrode material 23.

[0051] This invention achieves rapid ejection of the positive electrode material through the following innovative design: a linkage mechanism between the helical rack 7 and the helical gear 8 is incorporated. Driven by the electric push rod 3, this mechanism, through the lifting and lowering action of the pressure plate 4, causes the helical rack 7 to slide within the connecting block 5, thereby driving the helical gear 8 to rotate. The rotation of the helical gear 8 is transmitted to the second pulley 11 via the synchronous belt 10, which in turn moves the reciprocating lead screw 12, ultimately causing the base 13 and its supporting plate 14 to slide below the pressure seat 20. This design allows the compacted positive electrode material 23 to fall directly onto the supporting plate 14, eliminating the need for personnel to replace the ejection base, simplifying the operation process and improving work efficiency.

[0052] A further improvement lies in the addition of a clamping assembly, which mainly consists of a movable clamping plate 17, a telescopic rod 16, a pressure spring 18, and a pulling member 19. The movable clamping plate 17 is connected to the main body 2 of the device via the telescopic rod 16, while the pressure spring 18 provides the elastic force required for reset and clamping. When the pressure seat 20 is placed on the base 13, the operator can adjust the position of the movable clamping plate 17 by pulling the pulling member 19 to achieve a stable clamping of the pressure seat 20. The design of the clamping assembly not only ensures the stability of the pressure seat 20 during testing but also prevents the impact on the ejection of the positive electrode material 23 due to the displacement of the pressure seat 20, further improving the accuracy and reliability of the test. At the same time, this design also simplifies the positioning process of the pressure seat 20, making the operation more convenient.

[0053] The above content is only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed in this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A device for testing the compaction density of positive electrode material for batteries, characterized in that, The device includes a main body (2), which is composed of a top frame, a bottom frame, and a vertical frame between the top and bottom frames. A drive mechanism is fixedly installed on the bottom surface of the top frame, and a connecting block (5) is fixedly installed on the drive mechanism. An opening is provided on one side wall of the connecting block (5), and a helical rack (7) is installed at the opening. A return spring (6) is provided inside the connecting block (5), and the two ends of the return spring (6) are respectively connected to the helical rack (7) and the other side wall of the connecting block (5). A pulley synchronous transmission device is provided inside the vertical frame. Helical gears (8) and reciprocating screws (12) are respectively provided on the upper and lower pulleys of the pulley synchronous transmission device. The helical gears (8) and the helical rack (7) cooperate with each other, and the reciprocating screws (12) are connected to a base (13) provided on the bottom frame.

2. The battery cathode material compaction density testing device according to claim 1, characterized in that, The driving mechanism includes an electric push rod (3) and a pressure plate (4). The electric push rod (3) is fixedly connected to the bottom surface of the top frame, and the pressure plate (4) is fixedly connected to the bottom of the electric push rod (3). The connecting block (5) is fixedly installed on the top surface of the pressure plate (4).

3. The battery cathode material compaction density testing device according to claim 1, characterized in that, The connecting block (5) is a hollow box. The hollow box consists of a top surface, a bottom surface, and a first side wall (25) and a second side wall (26) located opposite to the top surface and the bottom surface. An opening is provided on the first side wall (25), and a helical rack (7) is provided at the position of the opening. A return spring (6) is provided inside the hollow box. One end of the return spring (6) is connected to the helical rack (7), and the other end is connected to the second side wall (26) opposite to the helical rack (7).

4. The battery cathode material compaction density testing device according to claim 1, characterized in that, The pulley synchronous transmission device includes a first pulley (9), a second pulley (11) and a synchronous belt (10). The first pulley (9) is located above the second pulley (11), and the synchronous belt (10) is sleeved between the first pulley (9) and the second pulley (11).

5. The battery cathode material compaction density testing device according to claim 1, characterized in that, The base (13) is divided into a support part and a test part; the test part is a solid part, and the support part is a downward-facing groove part.

6. The battery cathode material compaction density testing device according to claim 5, characterized in that, The groove portion is provided with a number of support plates (14) spaced apart. One end of each support plate (14) is connected to the test portion. A bidirectional threaded rod (15) is provided through the other end of each support plate (14). The two ends of the bidirectional threaded rod (15) are respectively in contact with the inner walls of the two sides of the base (13).

7. The battery cathode material compaction density testing device according to claim 6, characterized in that, The height of the support plate (14) is flush with the height of the solid part; the spacing between the support plates (14) is not less than the diameter of the positive electrode material (23).

8. The battery cathode material compaction density testing device according to claim 1, characterized in that, A pressure seat (20) and a clamping assembly are provided above the base (13), the clamping assembly being used to clamp the pressure seat (20).

9. The battery cathode material compaction density testing device according to claim 8, characterized in that, A plunger (21) is inserted inside the pressure base (20), and two pressure anvils (22) are arranged below the plunger (21), with a positive electrode material (23) arranged between the two pressure anvils (22).

10. The battery cathode material compaction density testing device according to claim 8, characterized in that, The clamping assembly includes a fixed clamping plate, a movable clamping plate (17), a telescopic rod (16), a pressure spring (18), and a pulling member (19). The fixed clamping plate and the movable clamping plate (17) are arranged opposite each other to jointly clamp the pressure seat (20). The fixed clamping plate is fixedly set on one side wall of the bottom frame. The telescopic rod (16) is connected to the other side wall of the bottom frame. One end of the movable clamping plate (17) and the telescopic rod (16) are fixedly connected. The other end of the telescopic rod (16) is connected to the pulling member (19). The pressure spring (18) is set inside the telescopic rod (16). The pulling member (19) passes through the other side wall of the bottom frame. The pulling member (19) passes through the pressure spring (18), the telescopic rod (16), and is connected to the movable clamping plate (17).

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