Lithium battery hot pressing device

Abstract

The invention discloses a lithium battery hot-pressing device, and belongs to the technical field of lithium batteries, the lithium battery hot-pressing device comprises a base, a control panel is arranged at the front position of the upper end of one side wall of the base, a pressing flatness measuring structure is arranged at the front position of the upper end face of the base, and the pressing flatness measuring structure comprises four hydraulic telescopic rods; the four hydraulic telescopic rods are arranged on the front portion of the center of the upper end face of the base in a rectangular arrangement mode, the output ends of the four hydraulic telescopic rods are fixedly connected with a first upper plate, four sleeves are arranged on the lower end face of the first upper plate in a rectangular arrangement mode, and rheostats are arranged in the centers of the interiors of the four sleeves; in addition, the flatness of the lithium battery can be converted into resistance value change, electric signals are transmitted to a control panel, the flatness of the lithium battery is quantitatively judged according to the resistance value difference, accurate taking and placing of the lithium battery are achieved, the production efficiency is improved, and the manual participation degree and the production error are reduced.

Description

Technical Field

[0001] This invention belongs to the field of lithium battery technology, specifically a lithium battery hot pressing device. Background Technology

[0002] In the manufacturing process of lithium-ion batteries, hot pressing is a key step that directly affects the performance and safety of the battery. Hot pressing can improve the bonding force between the active material in the electrode sheet and the current collector such as copper foil or aluminum foil, reduce the electrode porosity, and thus improve the energy density of the battery.

[0003] Existing lithium battery hot pressing devices have the following main shortcomings: In the existing lithium battery hot pressing process, the flatness of the electrode sheet has a significant impact on the battery's performance and safety. Uneven electrode sheets can lead to localized stress concentration, increasing the risk of internal short circuits and shortening the battery's cycle life. In addition, human error is more likely to occur during handling or operation, resulting in low production efficiency and unstable product quality. Summary of the Invention

[0004] To overcome the above-mentioned defects, the present invention provides a lithium battery hot pressing device, which solves the problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a lithium battery hot pressing device, comprising a base, a control panel being provided at the front of the upper end of one side wall of the base, and a pressing flatness measuring structure being provided at the front of the upper surface of the base; The flatness measurement structure includes four hydraulic telescopic rods, which are arranged in a rectangular pattern at the front center of the upper end face of the base. The output ends of the four hydraulic telescopic rods are fixedly connected to a first upper plate. The lower end face of the first upper plate is provided with four sleeves arranged in a rectangular pattern. A rheostat is provided at the center of each of the four sleeves. A sliding block is sleeved on the outer wall of each of the four rheostats. An inner cylinder is slidably connected at the lower center of each of the four sleeves. A pressure block is provided at the center of the lower end face of each of the four inner cylinders. A movable structure is provided at the front center of the upper surface of the base. Movable unloading structures are provided at the rear sides of both sides of the upper surface of the base. A collection box is provided at the rear center of the upper surface of the base. Four collection boxes are arranged in a rectangular pattern on the upper surface of the movable structure. Four preheating structures are arranged in a rectangular pattern on the upper surface of the movable structure.

[0006] As a further embodiment of the present invention: the movable structure includes a first sliding groove, which is located at the front center of the upper end face of the base. A first motor is located at the upper center of the front end face of the base. The output end of the first motor passes through the front end face of the base and the front end face of the first sliding groove and extends into the interior of the first sliding groove. A first lead screw is fixedly connected to the end of the motor. A first slider is threadedly fitted at the front and rear center of the outer side wall of the first lead screw. Slide rails are provided at the front of both sides of the upper end face of the base.

[0007] As a further embodiment of the present invention: the two movable unloading structures include two second slides, which are respectively located on the rear sides of the upper end face of the base. A second motor is provided on the upper sides of the rear end face of the base. The output ends of the two second motors pass through the rear end face of the base and the rear end face of the two second slides and are connected to the interior of the two second motors. A second lead screw is fixedly connected to the end of each motor. Two second sliders are threaded on the outer side walls of the two second lead screws. A second upper plate is provided at the center of the upper end face of the four second sliders.

[0008] As a further aspect of the present invention: the four preheating boxes are arranged in a rectangular pattern at the center of the upper surface of the movable unloading structure. Each of the four preheating boxes has a partition at the lower center of its interior. Each of the four preheating boxes has a heating tube at the lower end of the partition. Each of the four preheating boxes has a pressure sensor at the front of one side of the lower inner wall and a temperature sensor at the front of the other side of the lower inner wall. All four preheating boxes are detachably connected.

[0009] As a further embodiment of the present invention: a sliding plate is provided at the center of the upper end face of the two first sliders, and a sliding rail groove is provided at both sides of the center of the lower end face of the sliding plate. A placement platform is slidably connected at the center of the upper end face of the sliding plate. Limiting blocks are provided at both sides of the center of the front end face and the center of the rear end face of the sliding plate. The four limiting blocks are respectively rotatably connected to the center of the front end face and the rear end face of the placement platform at both sides. The two slide rails are respectively slidably connected inside the two sliding rail grooves.

[0010] As a further embodiment of the present invention: the lower end face of the second upper plate is provided with four pneumatic telescopic rods arranged in a rectangular shape, and the output ends of the four pneumatic telescopic rods are all fixedly connected to a first connecting plate, and a suction cup is provided at the center of the lower end face of the four first connecting plates.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this invention, the first upper plate is moved by a hydraulic telescopic rod to achieve downward pressure. The flatness of the lithium battery is converted into a change in resistance value by the cooperation of the pressure block, inner cylinder, sliding block and rheostat. The electrical signal is transmitted to the control panel to quantify and judge the flatness of the lithium battery based on the difference in resistance value. 2. In this invention, the moving structure and the moving unloading structure work together to meet the positioning requirements of each process of lithium battery production, achieve precise loading and unloading of lithium batteries, improve production efficiency, and reduce manual intervention and production errors. 3. In this invention, pressure and temperature signals are monitored in real time and transmitted to the control panel through a preheating box, heating tube, pressure sensor and temperature sensor, so as to adjust the heating state, accurately control the preheating process, improve preheating efficiency, enhance equipment safety, and facilitate maintenance and replacement of parts. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention from another perspective; Figure 3 This is a three-dimensional cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the three-dimensional side section structure of the present invention; Figure 5 This is a three-dimensional split structure diagram of the movable structure of the present invention; Figure 6 This is a three-dimensional disassembled structural diagram of the preheating structure of the present invention; Figure 7 for Figure 3 Enlarged diagram of point A in the middle.

[0013] In the diagram: 1. Base; 2. Control panel; 3. Flatness measurement structure; 301. Hydraulic telescopic rod; 302. First upper plate; 303. Sleeve; 304. Rheostat; 305. Sliding block; 306. Inner cylinder; 307. Pressure block; 4. Moving structure; 401. First slide groove; 402. First motor; 403. First lead screw; 404. First slider; 405. Slide rail; 406. Sliding rail groove; 407. Sliding plate; 40 8. Placement platform; 409. Limiting block; 5. Moving unloading structure; 501. Second chute; 502. Second motor; 503. Second lead screw; 504. Second slider; 505. Second upper plate; 506. Pneumatic telescopic rod; 507. First connecting plate; 508. Suction cup; 6. Collection box; 7. Preheating structure; 701. Preheating box; 702. Partition plate; 703. Heating tube; 704. Pressure sensor; 705. Temperature sensor. Detailed Implementation

[0014] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0015] like Figures 1-7 As shown, the present invention provides a technical solution: A lithium battery hot pressing device, comprising: The base 1 has a control panel 2 located at the front of the upper end of one side wall, a pressure flatness measuring structure 3 located at the front of the upper surface of the base 1, a moving structure 4 located at the front of the center of the upper surface of the base 1, moving unloading structures 5 located at the rear of both sides of the upper surface of the base 1, a collection box 6 located at the rear of the center of the upper surface of the base 1, four collection boxes 6 arranged in a rectangle on the upper surface of the moving structure 4, and four preheating structures 7 arranged in a rectangle on the upper surface of the moving structure 4.

[0016] The flatness measurement structure 3 includes four hydraulic telescopic rods 301. The four hydraulic telescopic rods 301 are arranged in a rectangle and positioned at the front center of the upper end face of the base 1. The output ends of the four hydraulic telescopic rods 301 are fixedly connected to a first upper plate 302. The lower end face of the first upper plate 302 is provided with four sleeves 303 arranged in a rectangle. A rheostat 304 is provided at the center of each of the four sleeves 303. A sliding block 305 is fitted on the outer wall of each of the four rheostats 304. An inner cylinder 306 is slidably connected at the lower center of each of the four sleeves 303. A pressure block 307 is provided at the center of the lower end face of each of the four inner cylinders 306.

[0017] When the lithium battery needs to be tested and measured, the hydraulic telescopic rod 301 is activated. The hydraulic oil pressure inside the hydraulic telescopic rod 301 drives the piston, which in turn pushes the output end up or down, causing the position of the first upper plate 302 to change. The first upper plate 302 moves towards the direction where the lithium battery is placed, pressing down on the lithium battery for measurement and testing. During the pressing process of the first upper plate 302, if the surface of the lithium battery is uneven, the supporting force on the pressure block 307 in contact with it will be uneven. For example, if there are bulges or depressions in the lithium battery, this will cause the inner cylinder 306 to slide up and down to varying degrees within the sleeve 303. When the inner cylinder 306 slides, the sliding block 305 will slide on the outer wall of the rheostat 304. The rheostat 304 is connected to... The resistance value of the circuit changes with the position of the sliding block 305. When the inner cylinder 306 slides upward, the length of the resistance wire connected to the circuit by the rheostat 304 becomes shorter, and the resistance value decreases. Conversely, when the inner cylinder 306 slides downward, the length of the resistance wire becomes longer, and the resistance value increases. The circuit generates a corresponding electrical signal output based on the change in the resistance value of the rheostat 304, and transmits this electrical signal to the control panel 2. The control panel 2 processes the received electrical signal for the operator. If the electrical signals corresponding to the four rheostats 304 show a large difference in resistance value, it means that the pressure on different points on the surface of the lithium battery is different, that is, the flatness of the lithium battery is unqualified. If the difference in resistance value is within the preset reasonable range, it indicates that the surface of the lithium battery is subjected to relatively uniform force and the flatness is good, so that the operator can make decisions based on the flatness.

[0018] The movable structure 4 includes a first slide groove 401, which is located at the front center of the upper end face of the base 1. A first motor 402 is located at the upper center of the front end face of the base 1. The output end of the first motor 402 passes through the front end face of the base 1 and the front end face of the first slide groove 401 and extends into the interior of the first slide groove 401. A first lead screw 403 is fixedly connected to the end of the motor. A first slider 404 is threadedly fitted at the front and rear centers of the outer side wall of the first lead screw 403. Slide rails 405 are located at the front centers of both sides of the upper end face of the base 1. A sliding plate 407 is provided at the center of the upper end face of the first slider 404. Sliding rail grooves 406 are provided on both sides of the center of the lower end face of the sliding plate 407. A placement platform 408 is slidably connected to the center of the upper end face of the sliding plate 407. Limiting blocks 409 are provided on both sides of the center of the front end face and the center of the center of the rear end face of the sliding plate 407. The four limiting blocks 409 are rotatably connected to the center of the front end face and the center of the rear end face of the placement platform 408 respectively. Two sliding rails 405 are slidably connected inside the two sliding rail grooves 406 respectively.

[0019] When the placement platform 408 needs to be moved, the first motor 402 is started to drive the first lead screw 403 to rotate, which in turn drives the first slider 404 to move. While the first slider 404 moves, the slide rail 405 slides in the slide rail groove 406, providing guidance and support for the movement of the sliding plate 407, ensuring that the sliding plate 407 can move smoothly and accurately. When the sliding plate 407 moves, the limiting block 409 moves with the sliding plate 407, which in turn drives the placement platform 408 to move on the sliding plate 407, facilitating the positioning of the lithium battery between different processing steps and making it convenient to place and remove the lithium battery.

[0020] The two movable unloading structures 5 include two second chutes 501, which are respectively located on the rear sides of the upper end face of the base 1. A second motor 502 is located on the upper sides of the rear end face of the base 1. The output ends of the two second motors 502 pass through the rear end face of the base 1 and the rear end face of the two second chutes 501, respectively, and are connected to the interior of the two second motors 502. A second lead screw 503 is fixedly connected to each end of the motor. Two second sliders 504 are threaded onto the outer walls of the two second lead screws 503. A second upper plate 505 is located at the center of the upper end face of the four second sliders 504. Four pneumatic telescopic rods 506 are arranged in a rectangular pattern on the lower end face of the second upper plate 505. A first connecting plate 507 is fixedly connected to the output ends of the four pneumatic telescopic rods 506. A suction cup 508 is located at the center of the lower end face of the four first connecting plates 507.

[0021] When it is necessary to remove or place lithium batteries, the second motor 502 is activated to drive the second lead screw 503 to rotate. The second lead screw 503 drives the second slider 504 to move, which in turn drives the second upper plate 505 to move, aligning the upper plate 505 with the lithium battery to be unloaded or placed. Once the upper plate 505 is in the appropriate position, four pneumatic telescopic rods 506 begin to operate. Driven by compressed air, the inner rods of the pneumatic telescopic rods 506 extend and push the first connecting plate 507 downward, bringing it closer to the lithium battery via the suction cup 508. When 508 approaches the surface of the lithium battery, it generates negative pressure, which tightly adheres to the lithium battery through the resulting suction force. When unloading is required, the pneumatic telescopic rod 506 retracts, causing the suction cup 508 holding the lithium battery to move upward and away from the downward working area. The second motor 502 then operates again, driving the second lead screw 503 to rotate, which in turn moves the second slider 504, the second upper plate 505, and the suction cup 508 holding the lithium battery to the unloading location. After reaching the upper end of the collection box 6, the pneumatic telescopic rod 506 extends its inner rod, releasing the negative pressure inside the suction cup 508, causing the lithium battery to detach from the suction cup 508, thus completing the unloading process.

[0022] The four preheating boxes 701 are arranged in a rectangular shape at the center of the upper surface of the movable unloading structure 5. Each of the four preheating boxes 701 has a partition 702 located at the lower center of its interior. Each of the four preheating boxes 701 has a heating tube 703 located at the lower end of the partition 702. Each of the four preheating boxes 701 has a pressure sensor 704 located at the front of one side of the lower inner wall and a temperature sensor 705 located at the front of the other side of the lower inner wall. All four preheating boxes 701 are detachably connected.

[0023] After the lithium battery is placed inside the preheating box 701, the heating tube 703 is energized and heats up, transferring the heat upwards to preheat the lithium battery inside the preheating box 701. Simultaneously, the flatness measuring structure 3 applies pressure downwards, causing heat to diffuse and accumulate within the sealed preheating box 701, gradually raising the temperature of the lithium battery to the initial temperature required for the hot pressing process. During the pressing process, the pressure sensor 704 monitors the pressure changes within the preheating box 701 in real time. Changes in the internal material state of the lithium battery during preheating may cause pressure changes; the pressure sensor 704 converts the pressure signal into electrical signals. The signal is transmitted to the control panel 2. At the same time, while the heating tube 703 is heating, the temperature inside the preheating box 701 is measured by the temperature sensor 705 and the temperature signal is also transmitted to the control panel 2. After receiving the signals from the pressure sensor 704 and the temperature sensor 705, the control panel 2 can adjust the working status of the heating tube 703 by the operator, such as increasing or decreasing the heating power, to ensure the stability and safety of the preheating process. When the preheating box 701 malfunctions, it can be quickly repaired or replaced by pulling out the pin, improving the maintenance efficiency and versatility of the equipment.

[0024] The working principle of this invention is as follows: After the workers place the lithium batteries to be hot-pressed into four preheating boxes 701, the heating tubes 703 are energized and heated. The heat generated is transferred upwards to preheat the lithium batteries placed in the preheating boxes 701. Simultaneously, the hydraulic oil pressure inside the hydraulic telescopic rod 301 drives the piston, which in turn pushes the first upper plate 302 downwards. The first upper plate 302 moves towards the lithium batteries, and the pressure block 307 presses down on the lithium batteries for measurement and testing. The pressure block 307 allows heat to diffuse and accumulate within the sealed preheating boxes 701, gradually raising the temperature of the lithium batteries to the initial temperature required for the hot-pressing process. During the downward pressing process of the first upper plate 302 and the pressure block 307, if there are any defects on the surface of the lithium batteries... In uneven conditions, the supporting force on the pressure block 307 in contact with it will be uneven. For example, if there are bulges or depressions in the lithium battery, the inner cylinder 306 will slide up and down to varying degrees within the sleeve 303. When the inner cylinder 306 slides, it will cause the sliding block 305 to slide on the outer wall of the rheostat 304. The resistance value of the rheostat 304 connected to the circuit changes with the position of the sliding block 305. When the inner cylinder 306 slides upward, the length of the resistance wire connected to the circuit of the rheostat 304 becomes shorter, and the resistance value decreases. Conversely, when the inner cylinder 306 slides downward, the length of the resistance wire becomes longer, and the resistance value increases. The circuit generates a corresponding electrical signal output based on the change in the resistance value of the rheostat 304, and transmits the electrical signal to the control panel 2.

[0025] The received electrical signals are processed by the control panel 2. If the resistance values ​​of the four rheostats 304 show significant differences, it means that the pressure on different points on the lithium battery surface is different, indicating that the flatness of the lithium battery is unqualified. If the resistance value difference is within the preset reasonable range, it indicates that the lithium battery surface is subjected to relatively uniform force and has good flatness, allowing the staff to make decisions based on the flatness. During the pressing process, the pressure sensor 704 monitors the pressure changes in the preheating box 701 in real time. During the preheating process, changes in the internal material state of the lithium battery may cause pressure changes. The pressure sensor 704 converts the pressure signal into an electrical signal and transmits it to the control panel 2. At the same time, when the heating tube 703 is heating, the temperature sensor 705 measures the temperature in the preheating box 701 and transmits the temperature signal to the control panel 2. After receiving the signals from the pressure sensor 704 and the temperature sensor 705, the control panel 2 allows the staff to adjust the working state of the heating tube 703, such as increasing or decreasing the heating power, to ensure the stability and safety of the preheating process.

[0026] When the preheating box 701 malfunctions, repair and replacement can be performed quickly by pulling out the pin, improving the maintenance efficiency and versatility of the equipment. After the hot-pressing preheating test is completed, the first motor 402 is started to drive the first lead screw 403 to rotate, which in turn drives the first slider 404 to move. While the first slider 404 moves, the slide rail 405 slides in the slide rail groove 406, providing guidance and support for the movement of the sliding plate 407, ensuring that the sliding plate 407 can move smoothly and accurately. When the sliding plate 407 moves, the limit block 409 moves with the sliding plate 407, and at the same time drives the placement platform 408 to move on the sliding plate 407, which facilitates the positioning of the lithium battery between different processing steps and makes it convenient to place and remove the lithium battery.

[0027] Furthermore, when it is necessary to remove and place lithium batteries, four pneumatic telescopic rods 506 are activated. Driven by compressed air, the pneumatic telescopic rods 506 extend and push the first connecting plate 507 downward, and approach the lithium battery through the suction cup 508. When the suction cup 508 approaches the surface of the lithium battery, it generates negative pressure, which tightly attracts the lithium battery. Then, the second motor 502 is activated to drive the second lead screw 503 to rotate. The second lead screw 503 drives the second slider 504 to move, and the second slider 504 drives the second upper plate 505 to move, so that the second upper plate 505 can reach the upper end of the collection box 6. The pneumatic telescopic rods 506 drive the inner rod to extend, allowing the lithium battery to enter the collection box 6. After that, the negative pressure in the suction cup 508 is released, allowing the lithium battery to detach from the suction cup 508, completing the unloading process.

[0028] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A lithium battery hot pressing device, characterized in that, include: The base (1) has a control panel (2) located at the front of the upper end of one side wall and a pressure flatness measuring structure (3) located at the front of the upper surface of the base (1). The flatness measurement structure (3) includes four hydraulic telescopic rods (301). The four hydraulic telescopic rods (301) are arranged in a rectangular shape at the front center of the upper end face of the base (1). The output ends of the four hydraulic telescopic rods (301) are fixedly connected to a first upper plate (302). The lower end face of the first upper plate (302) is provided with four sleeves (303) arranged in a rectangular shape. A rheostat (304) is provided at the center of the interior of each of the four sleeves (303). A sliding block (305) is sleeved on the outer wall of each of the four rheostats (304). An inner cylinder (306) is slidably connected at the lower center of the interior of each of the four sleeves (303). A pressure block (307) is provided at the center of the lower end face of each of the four inner cylinders (306). The base (1) has a movable structure (4) at the front of the center of the upper end face, and movable unloading structures (5) are provided on both sides of the upper end face of the base (1) at the rear. The base (1) has a collection box (6) at the rear of the center of the upper end face, and four collection boxes (6) are arranged in a rectangular pattern on the upper end face of the movable structure (4). Four preheating structures (7) are arranged in a rectangular pattern on the upper end face of the movable structure (4).

2. The lithium battery hot pressing device according to claim 1, characterized in that: The movable structure (4) includes a first slide groove (401), which is located at the front center of the upper end face of the base (1). A first motor (402) is located at the upper center of the front end face of the base (1). The output end of the first motor (402) passes through the front end face of the base (1) and the front end face of the first slide groove (401) and is connected to the interior of the first slide groove (401). A first lead screw (403) is fixedly connected to the end of the first lead screw (403). A first slider (404) is threaded on the front and rear centers of the outer side wall of the first lead screw (403). Slide rails (405) are provided on both sides of the upper end face of the base (1).

3. The lithium battery hot pressing device according to claim 1, characterized in that: The two movable unloading structures (5) include two second slides (501). The two second slides (501) are respectively located on the rear side of the upper end face of the base (1). The upper side of the rear end face of the base (1) is provided with a second motor (502). The output ends of the two second motors (502) pass through the rear end face of the base (1) and the rear end face of the two second slides (501) to the interior of the two second motors (502). The ends of the two motors (502) are fixedly connected with a second lead screw (503). The outer side wall of the two second lead screws (503) is threaded with two second sliders (504). The center of the upper end face of the four second sliders (504) is provided with a second upper plate (505).

4. The lithium battery hot pressing device according to claim 1, characterized in that: The four preheating boxes (701) are arranged in a rectangular shape at the center of the upper surface of the movable unloading structure (5). Each of the four preheating boxes (701) has a partition (702) at the lower center of its interior. Each of the four preheating boxes (701) has a heating tube (703) at the lower end of its interior. Each of the four preheating boxes (701) has a pressure sensor (704) at the front of one side of its lower inner wall and a temperature sensor (705) at the front of the other side of its lower inner wall. All four preheating boxes (701) are detachably connected.

5. A lithium battery hot pressing device according to claim 2, characterized in that: A sliding plate (407) is provided at the center of the upper end face of the two first sliders (404). A sliding rail groove (406) is provided at both sides of the center of the lower end face of the sliding plate (407). A placement platform (408) is slidably connected at the center of the upper end face of the sliding plate (407). A limiting block (409) is provided at both sides of the center of the front end face and the center of the rear end face of the sliding plate (407). The four limiting blocks (409) are rotatably connected to the center of the front end face and the rear end face of the placement platform (408) respectively. The two slide rails (405) are slidably connected inside the two sliding rail grooves (406).

6. The lithium battery hot pressing device according to claim 3, characterized in that: The lower end face of the second upper plate (505) is provided with four pneumatic telescopic rods (506) arranged in a rectangle. The output ends of the four pneumatic telescopic rods (506) are all fixedly connected to a first connecting plate (507). The center of the lower end face of the four first connecting plates (507) is provided with a suction cup (508).

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