Power type lithium battery production device and method

Abstract

The invention discloses a power type lithium battery production device and method, and belongs to the technical field of lithium battery production equipment. A power type lithium battery production device comprises a machine frame, a coating roller is rotationally installed on the machine frame, the power type lithium battery production device further comprises a storage box fixedly installed on the machine frame and a spraying piece arranged below the storage box, a corrugated pipe is connected between the spraying piece and the storage box, first friction wheels are fixedly installed at the two ends of the spraying piece, and second friction wheels are fixedly installed at the two ends of the spraying piece. A second friction wheel which can abut against the first friction wheel is fixedly installed on the coating roller, pressure parts are arranged at the two ends of the spraying piece, and when the first friction wheel rotates, the pressure parts periodically seal the working face of the spraying piece, and sectional type spraying is achieved; in the spraying process, the pressure part closes the working face of the spraying piece at a specific time point according to the set periodic action, slurry is prevented from flowing out, the needed segmented coating is formed, accurate segmented spraying is achieved, material waste is reduced, and cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production equipment, and in particular to a power type lithium battery production device and method. Background Art

[0002] As the global demand for clean energy and efficient energy storage solutions continues to increase, lithium-ion batteries, as energy storage devices with high energy density, long cycle life and low self-discharge rate, have been widely used, especially in the fields of electric vehicles (EV), hybrid electric vehicles (HEV) and other portable electronic devices. The demand for power lithium batteries is particularly prominent. In order to meet the growing market demand, efficient lithium battery production technology and equipment are particularly important.

[0003] At present, the production process of power lithium batteries mainly includes the following key steps: electrode material preparation, coating, drying, rolling, slitting, winding or lamination, liquid injection, sealing, etc. Among them, the uniform coating of electrode materials is one of the key links to ensure the consistency of battery performance and quality stability. The traditional coating process mainly relies on manual operation or semi-automatic equipment, and most of them are continuous coating on the sheet width, while the lithium-ion battery pole piece is segmented coating. If continuous coating is adopted and then fixed-length slitting is performed to produce pole pieces, the slurry coating needs to be scraped off at one end of each pole piece to expose the metal foil when assembling the battery. The process route of continuous coating and fixed-length slitting is inefficient and cannot meet the needs of final large-scale production. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the lithium-ion battery pole pieces in the prior art are coated in sections, and if continuous coating is adopted and then the pole pieces are cut to fixed lengths, the efficiency is low, and a power lithium battery production device and method are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A power lithium battery production device comprises a frame, on which a coating roller is rotatably mounted, the coating roller is driven to rotate by a motor and is used to smoothly move a substrate, and also comprises a storage box fixedly mounted on the frame, and a spraying member arranged below the storage box, a bellows is connected between the spraying member and the storage box, and the working surface of the spraying member faces the coating roller, wherein first friction wheels are fixedly mounted at both ends of the spraying member, and a second friction wheel that can abut against the first friction wheel is fixedly mounted on the coating roller, so that the spraying member can move synchronously with the rotation of the coating roller, and pressure parts are arranged at both ends of the spraying member, and when the first friction wheel rotates, the pressure part periodically closes the working surface of the spraying member to realize segmented spraying.

[0006] In order to evenly spray the electrode material stored in the storage box onto the substrate, preferably, the spraying part includes a spraying roller, a cavity for accommodating the slurry is opened in the spraying roller, the output end of the bellows extends into the cavity, and a dividing rod rotatably installed in the cavity, and a section of the dividing rod located in the cavity is in a spiral structure.

[0007] In order to avoid the formation of thick edges, further, the pitches at both ends of the dividing rod are smaller than the pitch of the middle part, so as to form a smooth transition.

[0008] In order to allow the two clamps to move closer to or farther from each other, form or close the slurry spraying area, and form the required segmented coating, it further includes symmetrically arranged clamps, which are slidably installed on the spraying roller through elastic parts, and the slurry spraying area is formed symmetrically between the clamps.

[0009] In order to achieve periodic closure of the working surface of the sprayed part and realize segmented spraying, the pressure part further includes a connecting wheel fixedly mounted on the dividing rod, a wedge block is slidably mounted on the connecting wheel through an elastic part, one end of the wedge block abuts against the inclined surface of the clamping plate, and a slider slidably mounted on the frame, an L-shaped rod is fixedly mounted on the slider, and the other end of the wedge block abuts against the inclined surface of the L-shaped rod.

[0010] In order to accurately control the working position of the spraying part relative to the coating roller, further, a support plate is symmetrically installed on the frame, a slide groove adapted to the slider is opened on the support plate, a threaded rod is installed in the inner thread of the support plate, and the slider is rotatably connected to the threaded rod.

[0011] In order to store the electrode material slurry and maintain the uniformity of the slurry, preferably, a rotating shaft is rotatably installed in the storage box, symmetrically arranged cranks are fixedly installed on the rotating shaft, connecting pins are fixedly connected between the symmetrical cranks, one end of the rotating shaft passes through the storage box and is transmission-connected to the coating roller, and a piston plate is slidably installed in the storage box, at least one through hole is opened on the piston plate, a one-way valve is installed in the through hole, wherein a connecting rod is rotatably connected between the piston plate and the connecting pin.

[0012] In order to reduce slurry residue, further, the bottom of the storage box is in an arc shape.

[0013] In order to ensure that the slurry is always in a uniform state and improve the spraying quality, further, a shaft sleeve is rotatably installed on the top surface of the storage box, a stirring paddle is fixedly installed on the shaft sleeve, a threaded groove is opened on the inner wall of the shaft sleeve, a vertical shaft is fixedly installed on the piston plate, and an embedded pin matching the threaded groove is fixedly installed on the vertical shaft.

[0014] A method for producing a power lithium battery comprises the following steps: S1: providing a metal foil as a substrate; S2: coating the metal foil with electrode material; S3: The intermittent action during the coating process is achieved through segmented control to form a segmented coating of a predetermined length.

[0015] Compared with the prior art, the present invention provides a power lithium battery production device and method, which has the following beneficial effects: 1. The power lithium battery production device rotates the coating roller in a directional manner so that the distributor rod rotates synchronously. On the one hand, the distribution of the slurry in the entire cavity is ensured. Since the pitch at both ends of the distributor rod is smaller than the pitch in the middle part, a smooth transition is formed. In this way, at the same speed, the slurry delivery per unit length in the middle part will be greater, while the delivery at both ends will be reduced. In this way, as the slurry is self-leveled, the formation of thick edges is avoided. On the other hand, during the spraying process, the connecting wheel rotates with the distributor rod. According to the set periodic action, the clamping plate is squeezed at a specific time point, so that the two clamping plates are close to each other to close the slurry spraying area, preventing the slurry from flowing out, forming the required segmented coating, reducing material waste, and improving production efficiency. 2. The power lithium battery production device rotates the coating roller in a directional manner, and the rotating shaft rotates synchronously therewith, driving the crank and the connecting pin to move. The connecting rod converts the rotational motion of the rotating shaft into the reciprocating motion of the piston plate. When the piston plate moves upward, the one-way valve in the through hole opens to suck in the slurry. When the piston plate moves downward, the one-way valve closes, pushing the slurry into the cavity of the spray roller through the bellows, and then spraying it on the substrate. At the same time, the up and down movement of the piston plate cooperates with the threaded groove on the inner wall of the sleeve through the vertical shaft and the embedded pin to rotate the sleeve. The rotation of the sleeve drives the stirring paddle to rotate, stir the slurry, prevent precipitation, ensure that the slurry is always in a uniform state, and improve the spraying quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a power lithium battery production device proposed by the present invention; Figure 2 This is a schematic diagram of the structure of a spray-coated part of a power lithium battery production device proposed by the present invention; Figure 3 Schematic diagram of the internal structure of a spray roller of a power lithium battery production device proposed by the present invention Figure 1 ; Figure 4 Schematic diagram of the internal structure of a spray roller of a power lithium battery production device proposed by the present invention Figure 2 ; Figure 5 This is a schematic diagram of the connecting wheel structure of a power lithium battery production device proposed by the present invention; Figure 6 A schematic diagram of the internal structure of a storage box of a power lithium battery production device proposed by the present invention; Figure 7 The present invention is a schematic diagram of the installation structure of the vertical shaft and sleeve of a power lithium battery production device.

[0017] In the figure: 1. frame; 2. coating roller; 3. storage box; 4. spraying part; 401. spraying roller; 402. dividing rod; 403. clamping plate; 404. cavity; 405. groove; 406. protrusion; 407. first spring; 5. bellows; 6. first friction wheel; 7. second friction wheel; 8. pressure part; 801. connecting wheel; 802. wedge block; 803. slider; 804. L-shaped rod; 805. second spring; 9. support plate; 901. slide groove; 10. threaded rod; 11. rotating shaft; 12. crank; 13. connecting pin; 14. piston plate; 1401. through hole; 15. connecting rod; 16. bushing; 1601. threaded groove; 17. stirring paddle; 18. vertical shaft; 19. embedded pin. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] Example: Reference Figure 1-Figure 7A power lithium battery production device includes a frame 1, which serves as the basic supporting structure of the entire equipment to ensure that all components are installed firmly. A coating roller 2 is rotatably installed on the frame 1, and the coating roller 2 is driven to rotate by a motor to smoothly move the substrate to ensure the stability and consistency of the substrate during the spraying process. It also includes a storage box 3 fixedly installed on the frame 1 for storing electrode material slurry, and a spraying member 4 arranged below the storage box 3, a bellows 5 is connected between the spraying member 4 and the storage box 3, and the working surface of the spraying member 4 faces the coating roller 2, which is responsible for uniformly spraying the electrode material stored in the storage box 3 onto the substrate, wherein a first friction wheel 6 is fixedly installed at both ends of the spraying member 4, and a second friction wheel 7 that can abut against the first friction wheel 6 is fixedly installed on the coating roller 2, so that the spraying member 4 can move synchronously with the rotation of the coating roller 2, and a pressure portion 8 is arranged at both ends of the spraying member 4. When the first friction wheel 6 rotates, the pressure portion 8 periodically closes the working surface of the spraying member 4 to achieve segmented spraying.

[0021] When the power lithium battery production device is working, after the motor is started, the coating roller 2 starts to rotate, driving the substrate placed thereon, such as a metal foil, to move forward. As the coating roller 2 rotates, the second friction wheel 7 also rotates and contacts the first friction wheel 6, so that the pressure parts 8 at both ends of the spraying part 4 also work synchronously with the coating roller 2. During the spraying process, the pressure part 8 closes the working surface of the spraying part 4 at a specific time point according to the set periodic action, prevents the slurry from flowing out, and forms the required segmented coating. This method not only realizes precise segmented spraying, but also because the spraying part 4 moves synchronously with the coating roller 2, the consistency of the position and length of each segment can be ensured, and the precise segmented spraying avoids unnecessary material spraying, reduces material waste, and saves costs.

[0022] In order to evenly spray the electrode material stored in the storage box 3 onto the substrate, the spraying part 4 includes a spraying roller 401, and a cavity 404 for accommodating the slurry is opened in the spraying roller 401. The output end of the bellows 5 extends into the cavity 404 to ensure that the slurry can smoothly flow into the cavity 404, and a dividing rod 402 is rotatably installed in the cavity 404. The dividing rod 402 is located in the cavity 404 and has a spiral structure to ensure the distribution of the slurry in the entire cavity 404, avoiding local accumulation or shortage. Preferably, since the pitch at both ends of the dividing rod 402 is smaller than the pitch in the middle part, a smooth transition is formed. In this way, at the same rotation speed, the slurry conveying amount per unit length in the middle part will be more, while the conveying amount at both ends will be reduced. In this way, as the slurry is self-leveled, the formation of thick edges is avoided.

[0023] It also includes symmetrically arranged clamping plates 403 which are slidably mounted on the spraying roller 401 through elastic members, and a slurry spraying area is formed between the symmetrical clamping plates 403 .

[0024] Specifically, a groove 405 is provided on one side of the spray roller 401 close to the coating roller 2, the clamping plate 403 has a protrusion 406 adapted to the groove 405, the elastic member is a first spring 407, and the two ends of the first spring 407 are fixedly connected to the inner wall of the groove 405 and the protrusion 406 respectively.

[0025] Through the arrangement of the above structure, the bellows 5 transports the electrode material slurry in the storage box 3 to the cavity 404 of the spray roller 401, and the dividing rod 402 rotates in the cavity 404. Due to its special pitch design, the pitch at both ends is small and the pitch in the middle is large. The dividing rod 402 can effectively push the slurry from one end to the other end, and at the same time ensure the uniform distribution of the slurry in the entire cavity 404. The symmetrically arranged clamping plates 403 are slidably installed on the spray roller 401 through the first spring 407. The area between the two clamping plates 403 is the slurry injection area. In this area, the slurry is precisely controlled and evenly sprayed onto the surface of the substrate. During the spraying process, the pressure part 8 squeezes the clamping plates 403 at a specific time point according to the set periodic action, so that the two clamping plates 403 are close to each other to close the slurry injection area, prevent the slurry from flowing out, and form the required segmented coating.

[0026] In order to achieve periodic closure of the working surface of the spray part 4 and realize segmented spraying, the pressure part 8 includes a connecting wheel 801 fixedly mounted on the dividing rod 402, which rotates with the dividing rod 402. A wedge block 802 is slidably mounted on the connecting wheel 801 through an elastic member. Preferably, the elastic member is a second spring 805. One end of the wedge block 802 abuts against the inclined surface of the clamping plate 403, and a slider 803 slidably mounted on the frame 1 can move along a predetermined track. An L-shaped rod 804 is fixedly mounted on the slider 803, and the other end of the wedge block 802 abuts against the inclined surface of the L-shaped rod 804.

[0027] Through the arrangement of the above-mentioned structure, the connecting wheel 801 rotates with the dividing rod 402. When the wedge block 802 on the connecting wheel 801 rotates to one side of the L-shaped rod 804, a lateral thrust is generated on the wedge block 802 by means of the inclined abutment. The wedge block 802 abuts against the inclined surface of the clamping plate 403, so that the two clamping plates 403 are close to each other, thereby closing the slurry injection area. When the wedge block 802 continues to rotate away from the L-shaped rod 804, the clamping plate 403 returns to its original position under the action of the first spring 407, and the slurry injection area is reopened. This process realizes a periodic opening and closing action, ensuring the precise control of the segmented spraying.

[0028] It should be noted that the pressure portion 8 is symmetrically arranged, and the wedge blocks 802 inside the pressure portion 8 are respectively in contact with the two clamping plates 403 .

[0029] Furthermore, a support plate 9 is symmetrically installed on the frame 1, and a slide groove 901 adapted to the slider 803 is opened on the support plate 9 for supporting and guiding the movement of the slider 803. A threaded rod 10 is installed on the inner thread of the support plate 9, and the slider 803 is rotatably connected to the threaded rod 10. By rotating the threaded rod 10, the position of the spray part 4 can be adjusted, thereby accurately controlling the working position of the spray part 4 relative to the coating roller 2.

[0030] It should be noted that the first friction wheel 6 is adjustable and can automatically adjust the radius according to the position of the spray part 4. The outer edge of the wheel body is designed to be expandable or contractible. For example, a multi-stage telescopic structure or a flexible material covering layer is adopted. The contact area can be adjusted according to the change of the position of the spray part 4. This is a prior art and will not be elaborated here.

[0031] In order to store the electrode material slurry and maintain the uniformity of the slurry, a rotating shaft 11 is rotatably installed in the storage box 3, and a symmetrically arranged crank 12 is fixedly installed on the rotating shaft 11. A connecting pin 13 is fixedly connected between the symmetrical cranks 12. One end of the rotating shaft 11 passes through the storage box 3 and is transmission-connected to the coating roller 2, and a piston plate 14 is slidably installed in the storage box 3. The piston plate 14 is provided with at least one through hole 1401. Specifically, the number of the through holes 1401 is 4-6. A one-way valve is installed in the through hole 1401 to allow the slurry to flow in one direction. A connecting rod 15 is rotatably connected between the piston plate 14 and the connecting pin 13 to convert the rotational motion of the rotating shaft 11 into the reciprocating motion of the piston plate 14. Preferably, the bottom of the storage box 3 is in an arc shape, which helps to reduce slurry residue, ensure that the slurry can flow smoothly to the spraying part 4, and improve material utilization.

[0032] Through the arrangement of the above structure, when the coating roller 2 rotates, the rotating shaft 11 rotates synchronously therewith, driving the crank 12 and the connecting pin 13 to move, and the connecting rod 15 converts the rotational motion of the rotating shaft 11 into the reciprocating motion of the piston plate 14. When the piston plate 14 moves upward, the one-way valve in the through hole 1401 opens to suck in the slurry. When the piston plate 14 moves downward, the one-way valve closes, pushing the slurry into the cavity 404 of the spray roller 401 through the bellows 5. The reciprocating motion of the piston plate 14 not only realizes the transportation of the slurry, but also plays a stirring role to prevent the slurry from settling and ensure the uniformity of the slurry.

[0033] A shaft sleeve 16 is rotatably mounted on the top surface of the storage box 3 , a stirring paddle 17 is fixedly mounted on the shaft sleeve 16 , a threaded groove 1601 is provided on the inner wall of the shaft sleeve 16 , a vertical shaft 18 is fixedly mounted on the piston plate 14 , an embedded pin 19 matching the threaded groove 1601 is fixedly mounted on the vertical shaft 18 .

[0034] Through the arrangement of the above structure, the up and down movement of the piston plate 14 cooperates with the threaded groove 1601 on the inner wall of the sleeve 16 through the vertical shaft 18 and the embedded pin 19, so that the sleeve 16 rotates. The rotation of the sleeve 16 drives the stirring paddle 17 to rotate, stirs the slurry, prevents precipitation, ensures that the slurry is always in a uniform state, and improves the spraying quality.

[0035] A method for producing a power lithium battery comprises the following steps: S1: When the motor is started, the coating roller 2 starts to rotate, driving the substrate placed thereon, such as a metal foil, to move forward; S2: As the coating roller 2 rotates, the rotating shaft 11 rotates synchronously, driving the crank 12 and the connecting pin 13 to move. The connecting rod 15 converts the rotational motion of the rotating shaft 11 into the reciprocating motion of the piston plate 14. When the piston plate 14 moves upward, the one-way valve in the through hole 1401 opens to suck the slurry. When the piston plate 14 moves downward, the one-way valve closes, pushing the slurry into the cavity 404 of the spray roller 401 through the bellows 5, and then spraying it on the substrate. S3: As the coating roller 2 rotates, the second friction wheel 7 also rotates and contacts the first friction wheel 6, and the material distribution rod 402 rotates synchronously to ensure the distribution of the slurry in the entire cavity 404; S4: The connecting wheel 801 rotates with the material distribution rod 402. When the wedge block 802 on the connecting wheel 801 rotates to one side of the L-shaped rod 804, a lateral thrust is generated on the wedge block 802 by means of abutment with the inclined surface. The wedge block 802 abuts with the inclined surface of the clamping plate 403, so that the two clamping plates 403 are close to each other, thereby closing the slurry injection area. When the wedge block 802 continues to rotate away from the L-shaped rod 804, the clamping plate 403 returns to its original position under the action of the first spring 407, and the slurry injection area is reopened. This process realizes a periodic opening and closing action, ensuring the precise control of the segmented spraying. S5: By rotating the threaded rod 10 , the position of the spraying member 4 can be adjusted, thereby accurately controlling the working position of the spraying member 4 relative to the coating roller 2 .

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A power lithium battery production device, comprising a frame (1), on which a coating roller (2) is rotatably mounted, the coating roller (2) being driven to rotate by a motor and used to stably move a substrate, characterized in that: It also includes a storage box (3) fixedly mounted on the frame (1), and A spraying member (4) is arranged below the storage box (3), a bellows (5) is connected between the spraying member (4) and the storage box (3), and a working surface of the spraying member (4) faces the coating roller (2). Wherein, first friction wheels (6) are fixedly mounted at both ends of the spraying member (4), and a second friction wheel (7) capable of abutting against the first friction wheel (6) is fixedly mounted on the coating roller (2), so that the spraying member (4) can move synchronously with the rotation of the coating roller (2), and pressure parts (8) are arranged at both ends of the spraying member (4), and when the first friction wheel (6) rotates, the pressure parts (8) periodically close the working surface of the spraying member (4), thereby realizing segmented spraying.

2. A power lithium battery production device according to claim 1, characterized in that: The spraying member (4) comprises a spraying roller (401), a cavity (404) for accommodating slurry is provided in the spraying roller (401), the output end of the bellows (5) extends into the cavity (404), and A distribution rod (402) is rotatably mounted in the cavity (404); a section of the distribution rod (402) located in the cavity (404) is in a spiral structure.

3. A power lithium battery production device according to claim 2, characterized in that: The pitches of the two ends of the material distribution rod (402) are smaller than the pitch of the middle part, forming a smooth transition.

4. A power lithium battery production device according to claim 3, characterized in that: It also includes symmetrically arranged clamping plates (403) which are slidably mounted on the spraying roller (401) via elastic members, and a slurry spraying area is formed between the symmetrical clamping plates (403).

5. A power lithium battery production device according to claim 4, characterized in that: The pressure part (8) comprises a connecting wheel (801) fixedly mounted on the material distribution rod (402), a wedge block (802) being slidably mounted on the connecting wheel (801) via an elastic member, one end of the wedge block (802) being in contact with the inclined surface of the clamping plate (403), and A sliding block (803) is slidably mounted on the frame (1), an L-shaped rod (804) is fixedly mounted on the sliding block (803), and the other end of the wedge block (802) abuts against the inclined surface of the L-shaped rod (804).

6. A power lithium battery production device according to claim 5, characterized in that: A support plate (9) is symmetrically mounted on the frame (1), a slide groove (901) adapted to the slider (803) is provided on the support plate (9), a threaded rod (10) is internally threadedly mounted on the support plate (9), and the slider (803) is rotatably connected to the threaded rod (10).

7. A power lithium battery production device according to claim 1, characterized in that: A rotating shaft (11) is rotatably mounted in the storage box (3), symmetrically arranged cranks (12) are fixedly mounted on the rotating shaft (11), a connecting pin (13) is fixedly connected between the symmetrical cranks (12), one end of the rotating shaft (11) passes through the storage box (3) and is drivingly connected to the coating roller (2), and A piston plate (14) is slidably mounted in the storage box (3), the piston plate (14) being provided with at least one through hole (1401), a one-way valve being installed in the through hole (1401). Wherein, a connecting rod (15) is rotatably connected between the piston plate (14) and the connecting pin (13).

8. A power lithium battery production device according to claim 7, characterized in that: The bottom of the storage box (3) is in an arc shape.

9. A power lithium battery production device according to claim 8, characterized in that: A shaft sleeve (16) is rotatably mounted on the inner top surface of the storage box (3), a stirring paddle (17) is fixedly mounted on the shaft sleeve (16), a threaded groove (1601) is formed on the inner wall of the shaft sleeve (16), a vertical shaft (18) is fixedly mounted on the piston plate (14), and an embedded pin (19) matched with the threaded groove (1601) is fixedly mounted on the vertical shaft (18).

10. A method for producing a power lithium battery, comprising a power lithium battery production device according to any one of claims 1 to 9, characterized in that: The following steps are also included: S1: providing a metal foil as a substrate; S2: coating the metal foil with electrode material; S3: The intermittent action during the coating process is achieved through segmented control to form a segmented coating of a predetermined length.

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