Electrode Sheet Cutting Device

Abstract

The present invention relates to a pole piece cutting device, belonging to the technical field of lithium battery manufacturing. The pole piece cutting device includes a driving mechanism, a cutting tool mechanism, a mounting frame and a support frame, wherein: the driving mechanism includes a driving member, an eccentric wheel and a connecting component. The fixed end of the driving member is fixedly connected to the support frame, the movable end of the driving member is installed with an eccentric wheel, and the eccentric wheel is connected to the first end of the connecting component; the cutting tool mechanism includes an upper cutting tool component and a lower cutting tool component. The upper cutting tool component is fixedly connected to the second end of the connecting component and moves up and down driven by the driving member; the lower cutting tool component is fixedly installed on the mounting frame; the mounting frame is horizontally slidably installed on the support frame, the connecting component is vertically slidably connected to the mounting frame, and the mounting frame moves along the conveying direction of the pole piece driven by the driving member. By driving the driving member and the eccentric wheel to drive the cutting tool to move simultaneously in the horizontal and vertical directions, the effect of chasing and cutting the pole piece is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and more specifically to a pole piece cutting device. Background Art

[0002] In the existing process, when cutting the pole piece, the pole piece must stop the conveying movement. Otherwise, it will cause the subsequent pole piece to bulge and deform, affecting the quality of the pole piece for the next cutting. Therefore, the related conveying mechanism has to stop and start periodically. Stopping the conveying of the pole piece will inevitably lead to a reduction in the efficiency of cutting the pole piece.

[0003] In order to improve efficiency and achieve continuous cutting, the existing solution is to set a driving member to drive the upper cutting knife to move up and down to achieve cutting, and another driving member to drive the cutting knife assembly to move horizontally back and forth, so that when cutting the pole piece, the cutting knife can be relatively stationary with the pole piece in the horizontal direction to achieve uninterrupted conveying of the pole piece. However, the above technical solution requires two driving members to achieve the movement of the cutting knife in two directions to cut the pole piece, the movement process is complex, the probability of failure increases, and when maintenance is required, there are also problems of cumbersome operation and poor movement stability. Summary of the Invention

[0004] The present invention aims at the problems of the existing pole piece cutting device, and provides a pole piece cutting device with simple and reliable structure and high cutting efficiency.

[0005] The technical solution of the pole piece cutting device in the present invention is as follows: A pole piece cutting device includes a driving mechanism, a cutting knife mechanism, a mounting frame and a support frame. Among them: The driving mechanism includes a driving member, an eccentric wheel and a connecting component. The fixed end of the driving member is fixedly connected to the support frame, the movable end of the driving member is installed with an eccentric wheel, and the eccentric wheel is connected to the first end of the connecting component; The cutting knife mechanism includes an upper cutting knife assembly and a lower cutting knife assembly. The upper cutting knife assembly is fixedly connected to the second end of the connecting component and is configured to lift under the drive of the driving member; The lower cutting knife assembly is fixedly installed on the mounting frame; The mounting frame is horizontally slidably installed on the support frame, the connecting component is vertically slidably connected to the mounting frame, and the mounting frame is configured to move along the conveying direction of the pole piece under the drive of the driving member.

[0006] By driving the driving member and the eccentric wheel to drive the cutting knife to move in both the horizontal and vertical directions at the same time, the effect of chasing and cutting the pole piece is achieved.

[0007] Optionally, there are two groups of driving mechanisms, and the two groups of driving mechanisms are symmetrically arranged on both sides of the support frame. Both ends of the upper cutting knife assembly are fixedly connected to the corresponding driving mechanisms, and the two groups of driving mechanisms are configured to synchronously drive the upper cutting knife assembly to lift.

[0008] By setting two groups of symmetric driving mechanisms, the two ends of the cutting knife mechanism move synchronously, which is more stable.

[0009] Optionally, the connecting component includes a rotating plate and a fixed plate. The first end of the rotating plate is fixedly connected to the fixed plate, the second end of the rotating plate is connected to the eccentric wheel, the upper cutting tool component is fixedly connected to the fixed plate, the rotating plate and the fixed plate are fixedly connected through a support shaft, and a space for the side plate of the mounting frame to pass through is formed among the rotating plate, the fixed plate and the support shaft.

[0010] The designed structures of the rotating plate and the fixed plate are simple, and at the same time, the effect of converting the circular motion of the motor into a linear motion in the horizontal direction can be achieved.

[0011] Optionally, the side plate of the mounting frame is slidably mounted on the fixed plate through a vertically arranged first sliding component, and the connecting component is configured to move up and down along the first sliding component on the side plate.

[0012] The circular motion of the motor is converted into a linear motion in the vertical direction through the first sliding component.

[0013] Optionally, a cam is arranged on the eccentric wheel, a limiting hole corresponding to the cam is arranged on the rotating plate, and the cam is configured to rotate in the limiting hole.

[0014] Through the design of the limiting hole and the cam, the motor, the rotating plate and the connecting component are formed into a whole.

[0015] Optionally, the upper cutting tool component includes an upper die holder and an upper cutting tool. The upper cutting tool is fixedly installed on the upper die holder, and the upper die holder is fixedly connected to the connecting component; the lower cutting tool component includes a lower cutting tool and a lower die holder. The lower cutting tool is fixedly installed on the lower die holder, and the lower die holder is fixedly installed on the mounting frame; the cutting tool mechanism further includes a guide rod and a spring, wherein: the lower end of the guide rod is fixedly connected to the lower die holder, the upper die holder is sleeved on the upper end of the guide rod and is configured to be slidably lifted on the guide rod; the spring is sleeved on the guide rod, one end of the spring abuts against the upper die holder, and the other end of the spring abuts against the lower die holder.

[0016] The guide rod guides the upper die holder, and the spring buffers the upper die holder, so that the upper cutting tool component cuts more smoothly and has a good effect.

[0017] Optionally, the pole piece cutting device further includes a pressing component located at the post-station of the cutting tool mechanism. The pressing component includes an upper pressing plate, an elastic guide rod and a lower pressing plate, wherein: the lower pressing plate is fixedly installed on the lower cutting tool component and is located below the upper pressing plate; one end of the elastic guide rod is fixedly connected to the upper pressing plate, and the other end of the elastic guide rod is connected to the upper cutting tool component; the upper pressing plate is configured to move close to and away from the lower pressing plate under the drive of the upper cutting tool component, and the elastic guide rod is configured to contract in the moving direction of the upper pressing plate; the upper pressing plate and the lower pressing plate cooperate to clamp the pole piece located between the upper pressing plate and the lower pressing plate.

[0018] By arranging the pressing component, the pole piece is pressed before cutting and the pole piece is also pushed after cutting.

[0019] Optionally, the lower pressing plate is provided with a first cleaning part, and the first cleaning part is arranged towards the cutting position of the cutting tool mechanism, and / or, the upper pressing plate is provided with a second cleaning part, and the second cleaning part is arranged towards the cutting position of the cutting tool mechanism; the first cleaning part or the second cleaning part is configured to clean the dust at the cutting position.

[0020] The dust at the cutting position is cleaned by the first cleaning part to avoid equipment contamination.

[0021] Optionally, the pole piece cutting device further includes a guiding component located in front of the cutting tool mechanism, and the guiding component includes an upper guiding plate and a lower guiding plate arranged up and down, and a guiding gap for the pole piece to pass through is formed between the upper guiding plate and the lower guiding plate.

[0022] The pole piece is guided by the guiding component to ensure that the pole piece can be fed smoothly and improve the cutting effect.

[0023] Optionally, when the driving part drives the mounting rack to move along the conveying direction of the pole piece, the moving speed of the mounting rack is the same as the conveying speed of the pole piece.

[0024] By setting the moving speed of the mounting rack to be the same as the conveying speed of the pole piece, the effect that the pole piece is cut off during conveying is achieved. Description of the Drawings

[0025] Figure 1 It is a schematic perspective view of a pole piece cutting device according to an optional embodiment of the present invention;

[0026] Figure 2 is Figure 1 a schematic structural view of the driving mechanism, the mounting rack and the support frame in

[0027] Figure 3 It is a schematic perspective view of a driving mechanism according to an optional embodiment of the present invention;

[0028] Figure 4 is Figure 1 a schematic structural view of the cutting tool mechanism in

[0029] Figure 5 It is a schematic perspective view of the pressing component according to the present invention;

[0030] Figure 6 It is a schematic perspective view of the guiding component according to the present invention. Detailed Embodiments

[0031] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0032] During the manufacturing process of lithium battery cells, it is necessary to cut a rolled electrode strip into electrode sheets with a fixed width after shaping. In the existing cutting process, the electrode strip is usually cut by a cutting knife, and during cutting, the conveying of the electrode strip stops. Otherwise, the subsequent electrode will bulge and deform, affecting the quality of the electrode sheet cut next time. Therefore, the related conveying mechanism needs to stop and start periodically. Stopping the conveying of the electrode strip will inevitably lead to a reduction in the cutting efficiency of the electrode sheet.

[0033] In view of this, the present invention provides an electrode sheet cutting device capable of synchronously completing cutting during the conveying process of the electrode sheet. As Figures 1-3 shown, an electrode sheet cutting device provided by the present application includes a support frame 1, a mounting frame 2, a driving mechanism 3 and a cutting knife mechanism 4, wherein: the driving mechanism 3 includes a driving member 31, an eccentric wheel 32 and a connecting component 33. The fixed end of the driving member 31 is fixedly connected to the support frame 1, the movable end of the driving member 31 is provided with an eccentric wheel 32, and the eccentric wheel 32 is connected to the first end of the connecting component 33; the mounting frame 2 is horizontally slidably mounted on the support frame 1, the connecting component 33 is vertically slidably connected to the mounting frame 2, and the mounting frame 2 is slidably mounted on the slide rail of the support frame 1 through a slider and is configured to reciprocate along the conveying direction of the electrode sheet under the drive of the driving member 31. By driving the driving member 31 and the eccentric wheel 32 to drive the cutting knife mechanism 4 to move simultaneously in the horizontal and vertical directions, the effect of chasing and cutting the electrode sheet is achieved.

[0034] As Figure 4 shown, in an implementable embodiment, the cutting knife mechanism 4 includes an upper cutting knife assembly 41 and a lower cutting knife assembly 42. The upper cutting knife assembly 41 is fixedly connected to the second end of the connecting component 33 and is configured to move up and down under the drive of the driving member 31. Optionally, the driving member 31 can be a servo motor or a DD motor; the lower cutting knife assembly 42 is fixedly mounted on the mounting frame 2. Optionally, the upper cutting knife assembly 41 includes an upper die base 411 and an upper cutting knife 412. The upper cutting knife 412 is fixedly mounted on the upper die base 411, and the upper die base 411 is fixedly connected to the connecting component 33; the lower cutting knife assembly 42 includes a lower cutting knife 422 and a lower die base 421. The lower cutting knife 422 is fixedly mounted on the lower die base 421, and the lower die base 421 is fixedly mounted on the mounting frame 2; the cutting knife mechanism 4 further includes a guide rod 43 and a spring 44, wherein: the lower end of the guide rod 43 is fixedly connected to the lower die base 421, the upper die base 411 is sleeved on the upper end of the guide rod 43 and is configured to be slidable and liftable on the guide rod 43; the spring 44 is sleeved on the guide rod 43, one end of the spring 44 abuts against the upper die base 411, and the other end of the spring 44 abuts against the lower die base 421. By guiding the upper die base 411 through the guide rod 43 and buffering the descending process of the upper die base 411 by the spring 44, the cutting of the upper cutting knife assembly 41 is more stable and the effect is good.

[0035] In this embodiment, there are two sets of driving mechanisms 3, which are symmetrically arranged on both sides of the support frame 1. Both ends of the upper cutting knife assembly 41 are fixedly connected to the corresponding driving mechanisms 3, and the two sets of driving mechanisms 3 are configured to synchronously drive the upper cutting knife assembly 41 to move up and down.

[0036] Refer again to Figure 3 , in an implementable embodiment, the connecting component 33 includes a rotating plate 331 and a fixing plate 332. The first end of the rotating plate 331 is fixedly connected to the fixing plate 332, the second end of the rotating plate 331 is connected to the eccentric wheel 32, and the upper cutting knife assembly 41 is fixedly connected to the fixing plate 332. The rotating plate 331 and the fixing plate 332 are fixedly connected by a support shaft 333. A space is formed among the rotating plate 331, the fixing plate 332, and the support shaft 333 for the side plate 21 of the mounting frame 2 to pass through. The design structures of the rotating plate 332 and the fixing plate 332 are simple, and the cooperation of the slider and the slide rail can simultaneously achieve the effect of converting the circular motion of the motor into a linear motion in the horizontal direction. Optionally, a cam 321 is provided on the eccentric wheel 32, and a limiting hole corresponding to the cam 321 is provided on the rotating plate 331. The cam 321 is configured to rotate in the limiting hole. Through the design of the limiting hole and the cam 321, the motor, the rotating plate 332, and the connecting component 33 form an integral body.

[0037] In this embodiment, the side plate 21 of the mounting frame 2 is slidably mounted on the fixing plate 332 through a vertically arranged first sliding component 22, and the connecting component 33 is configured to move up and down along the first sliding component 22 on the side plate 21. Optionally, the first sliding component includes a slider and a slide rail.

[0038] As Figure 5As shown, in an implementable embodiment, the pole piece cutting device further includes a pressing component 5 located at the post-station of the cutter mechanism 4. The pressing component 5 includes an upper pressing plate 51, an elastic guiding rod 53, and a lower pressing plate 52, where: the lower pressing plate 52 is fixedly installed on the lower cutter component 42 and is located below the upper pressing plate 51; one end of the elastic guiding rod 53 is fixedly connected to the upper pressing plate 51, and the other end of the elastic guiding rod 53 is connected to the upper cutter component 41; the upper pressing plate 51 is configured to move closer to and away from the lower pressing plate 52 driven by the upper cutter component 41, and the elastic guiding rod 53 is configured to contract in the moving direction of the upper pressing plate 51; the upper pressing plate 51 and the lower pressing plate 52 cooperate to clamp the pole piece located between the upper pressing plate 51 and the lower pressing plate 52. During the process of cutting the pole piece, when the upper cutter component 41 descends, the upper pressing plate 51 first contacts the pole piece and continues to move downward. The elastic guiding rod 53 contracts and at the same time the elastic guiding rod 53 provides a downward elastic force to the upper pressing plate 51, so that the upper pressing plate 51 presses the pole piece against the lower pressing plate 52, and then continues to descend until the upper cutter 12 and the lower cutter 22 are butted to complete the cutting of the pole piece. After the pole piece cutting is completed, the upper cutter component 41 ascends. The upper cutter 412 and the lower cutter 422 are first separated, then the elastic guiding rod 53 returns to its original position, and finally the upper pressing plate 51 and the lower pressing plate 52 are separated. The design of pressing the pole piece by the upper pressing plate 51 and the lower pressing plate 52 before cutting the pole piece can ensure that the pole piece does not move when the upper cutter 412 and the lower cutter 422 cut the pole piece, improving the cutting accuracy and quality.

[0039] Optionally, the lower pressing plate 52 is provided with a first cleaning part, the first cleaning part is arranged towards the cutting position of the cutter mechanism 4, and / or, the upper pressing plate 51 is provided with a second cleaning part, the second cleaning part is arranged towards the cutting position of the cutter mechanism 4; the first cleaning part or the second cleaning part is configured to clean the dust at the cutting position. The first cleaning part includes a dust suction cavity and an adsorption groove. The adsorption cavity is communicated with the adsorption groove, the front stage of the adsorption cavity is communicated with a vacuum generator, and the adsorption groove sucks away the impurities remaining at the cutting position through the suction force generated by the vacuum generator.

[0040] As Figure 6 As shown, in an implementable embodiment, the pole piece cutting device further includes a guiding component 6 located at the front stage of the cutter mechanism 4. The guiding component 6 includes an upper guiding plate 61 and a lower guiding plate 62 arranged up and down. A guiding gap for the pole piece to pass through is formed between the upper guiding plate 61 and the lower guiding plate 62. By guiding the pole piece through the guiding component, it is ensured that the pole piece can be fed smoothly, improving the cutting effect.

[0041] In this embodiment, when the driving member 31 drives the mounting bracket 2 to move along the conveying direction of the pole piece, the moving speed of the mounting bracket 2 is the same as the conveying speed of the pole piece. By setting the moving speed of the mounting bracket 2 to be the same as the conveying speed of the pole piece, the effect that the pole piece is cut off during the conveying process is achieved. Optionally, the mounting bracket 2 is slidably mounted on the support frame 1 through a laterally arranged second sliding assembly, and the extending direction of the second sliding assembly is the same as the conveying direction of the pole piece.

[0042] The above description of the present invention is detailed enough and has a certain particularity. Those of ordinary skill in the art should understand that the description in the embodiments is only exemplary, and all changes made without departing from the true spirit and scope of the present invention should fall within the protection scope of the present invention. The scope of protection required by the present invention is defined by the claims described, rather than by the above description in the embodiments.

Claims

1. A pole piece cutting device, characterized in that, The pole piece cutting device includes a driving mechanism, a cutting tool mechanism, a mounting frame and a support frame, wherein: The driving mechanism includes a driving member, an eccentric wheel and a connecting component. The fixed end of the driving member is fixedly connected to the support frame, the movable end of the driving member is provided with an eccentric wheel, and the eccentric wheel is connected to the first end of the connecting component; The cutting tool mechanism includes an upper cutting tool component and a lower cutting tool component. The upper cutting tool component is fixedly connected to the second end of the connecting component and is configured to move up and down driven by the driving member; the lower cutting tool component is fixedly installed on the mounting frame; The mounting frame is horizontally slidably installed on the support frame, the connecting component is vertically slidably connected to the mounting frame, and the mounting frame is configured to move along the conveying direction of the pole piece driven by the driving member; The connecting component includes a rotating plate and a fixing plate. The first end of the rotating plate is fixedly connected to the fixing plate, the second end of the rotating plate is connected to the eccentric wheel, the upper cutting tool component is fixedly connected to the fixing plate, the rotating plate and the fixing plate are fixedly connected by a support shaft, and a space for the side plate of the mounting frame to pass through is formed between the rotating plate, the fixing plate and the support shaft; The side plate of the mounting frame is slidably installed on the fixing plate through a vertically arranged first sliding component, and the connecting component is configured to move up and down along the first sliding component on the side plate; A cam is arranged on the eccentric wheel, a limiting hole corresponding to the cam is arranged on the rotating plate, and the cam is configured to rotate in the limiting hole; The upper cutting tool component includes an upper die base and an upper cutting tool. The upper cutting tool is fixedly installed on the upper die base, and the upper die base is fixedly connected to the connecting component; The lower cutting tool component includes a lower cutting tool and a lower die base. The lower cutting tool is fixedly installed on the lower die base, and the lower die base is fixedly installed on the mounting frame.

2. The pole piece cutting device according to claim 1, characterized in that, There are two groups of the driving mechanisms, and the two groups of driving mechanisms are symmetrically arranged on both sides of the support frame. Both ends of the upper cutting tool component are respectively fixedly connected to the corresponding driving mechanisms, and the two groups of driving mechanisms are configured to synchronously drive the upper cutting tool component to move up and down.

3. The pole piece cutting device according to claim 1, characterized in that, The cutting tool mechanism further includes a guide rod and a spring, wherein: The lower end of the guide rod is fixedly connected to the lower die base, and the upper die base is sleeved on the upper end of the guide rod and is configured to be slidable up and down on the guide rod; The spring is sleeved on the guide rod, one end of the spring abuts against the upper die base, and the other end of the spring abuts against the lower die base.

4. The pole piece cutting device according to claim 1, wherein, The pole piece cutting device further includes a pressing component located at the post-station of the cutting tool mechanism. The pressing component includes an upper pressing plate, an elastic guide rod and a lower pressing plate, wherein: The lower pressing plate is fixedly installed on the lower cutting tool component and is located below the upper pressing plate; One end of the elastic guide rod is fixedly connected to the upper pressing plate, and the other end of the elastic guide rod is connected to the upper cutting tool component; The upper pressing plate is configured to move close to and away from the lower pressing plate driven by the upper cutting tool component, and the elastic guide rod is configured to be contractible in the moving direction of the upper pressing plate; The upper pressing plate and the lower pressing plate cooperate to clamp the electrode sheet located between the upper pressing plate and the lower pressing plate.

5. The pole piece cutting device according to claim 4, characterized in that, The lower pressing plate is provided with a first cleaning portion, and the first cleaning portion is arranged towards the cutting position of the cutting mechanism, and / or the upper pressing plate is provided with a second cleaning portion, and the second cleaning portion is arranged towards the cutting position of the cutting mechanism; The first cleaning portion or the second cleaning portion is configured to clean the dust at the cutting position.

6. The pole piece cutting device according to claim 1, wherein, The electrode sheet cutting device further includes a guiding assembly located in front of the cutting mechanism. The guiding assembly includes an upper guiding plate and a lower guiding plate arranged up and down, and a guiding gap for the electrode sheet to pass through is formed between the upper guiding plate and the lower guiding plate.

7. The pole piece cutting device according to claim 1, wherein When the driving member drives the mounting rack to move along the conveying direction of the electrode sheet, the moving speed of the mounting rack is the same as the conveying speed of the electrode sheet.

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